DebTik/internal/web/static/app.js

// DebTik - Debian Linux Router Frontend Application Logic

// ================= Interceptor: Automatic Auth Bearer & 401 Handling =================
const originalFetch = window.fetch.bind(window);
const pendingAPIReads = new Map();
const telemetryHealth = { lastSuccess: 0, failures: new Map() };
let coreRefreshPromise = null;
let lastSummaryRefresh = 0;

function renderTelemetryHealth() {
  const el = document.getElementById('telemetry-health');
  if (!el) return;
  const failures = [...telemetryHealth.failures.entries()];
  const seconds = telemetryHealth.lastSuccess ? Math.floor((Date.now() - telemetryHealth.lastSuccess) / 1000) : null;
  const stale = seconds === null || seconds > 15;
  el.textContent = failures.length ? `Data unavailable / incomplete${seconds === null ? '' : ` · updated ${seconds}s ago`}` : stale ? 'Waiting for fresh data' : `Updated ${seconds}s ago`;
  el.className = `text-[10px] font-mono ${failures.length || stale ? 'text-amber-400' : 'text-emerald-400'}`;
  el.title = failures.length ? failures.map(([path, error]) => `${path}: ${error}`).join('\n') : telemetryHealth.lastSuccess ? `Last successful update: ${new Date(telemetryHealth.lastSuccess).toLocaleTimeString()}` : 'No successful update yet';
}

function stopSessionPolling() {
  if (window._telemetryInterval) clearInterval(window._telemetryInterval);
  window._telemetryInterval = null;
  if (trafficEventSource) trafficEventSource.close();
  trafficEventSource = null;
  if (trafficPollFallback) clearInterval(trafficPollFallback);
  trafficPollFallback = null;
  if (bwtestState.pollTimer) clearInterval(bwtestState.pollTimer);
  bwtestState.pollTimer = null;
  if (logsTimer) clearInterval(logsTimer);
  logsTimer = null;
  stopFwStatPolling();
  stopNATStatPolling();
  stopMangleStatPolling();
  telemetryHealth.failures.clear();
  telemetryHealth.lastSuccess = 0;
  lastSummaryRefresh = 0;
}

window.fetch = async function(resource, options = {}) {
  const url = new URL(resource instanceof Request ? resource.url : resource, window.location.href);
  const isAPI = url.origin === window.location.origin && url.pathname.startsWith('/api/');
  if (!isAPI) return originalFetch(resource, options);
  const config = { ...options, headers: new Headers(options.headers || (resource instanceof Request ? resource.headers : undefined)) };
  const token = localStorage.getItem('debtik_token');
  if (token && !config.headers.has('Authorization')) config.headers.set('Authorization', `Bearer ${token}`);
  const method = (config.method || (resource instanceof Request ? resource.method : 'GET')).toUpperCase();
  const isRead = method === 'GET' && !url.pathname.includes('/stream') && !url.pathname.startsWith('/api/auth/');
  const key = `${url.href}|${JSON.stringify([...config.headers])}`;
  if (isRead && pendingAPIReads.has(key)) return (await pendingAPIReads.get(key)).clone();
  const perform = async () => {
    let timeout;
    if (isRead && !config.signal) {
      const controller = new AbortController();
      config.signal = controller.signal;
      timeout = setTimeout(() => controller.abort(), 15000);
    }
    try {
      const response = await originalFetch(resource, config);
      if (isRead) {
        if (response.ok) {
          telemetryHealth.lastSuccess = Date.now();
          telemetryHealth.failures.delete(url.pathname);
        } else {
          telemetryHealth.failures.set(url.pathname, `HTTP ${response.status}; displayed values may be old`);
        }
        renderTelemetryHealth();
      }
      if (response.status === 401 && url.pathname !== '/api/auth/login' && state.currentUser && token === localStorage.getItem('debtik_token')) {
        stopSessionPolling();
        state.isPolling = false;
        state.currentUser = null;
        localStorage.removeItem('debtik_token');
        showLoginScreen(true);
      }
      return response;
    } catch (err) {
      if (isRead) {
        telemetryHealth.failures.set(url.pathname, err.name === 'AbortError' ? 'Request timed out' : 'Connection failed; displayed values may be old');
        renderTelemetryHealth();
      }
      throw err;
    } finally {
      if (timeout) clearTimeout(timeout);
    }
  };
  if (!isRead) return perform();
  const request = perform();
  pendingAPIReads.set(key, request);
  try { return (await request).clone(); }
  finally { if (pendingAPIReads.get(key) === request) pendingAPIReads.delete(key); }
};

let state = {
  currentUser: null,
  users: [],
  interfaces: [],
  vlans: [],
  systemStatus: null,
  vpnStatus: null,
  routes: [],
  activeTab: 'dashboard',
  fwSubTab: 'filter',
  bridgeSubTab: 'bridges',
  bridges: [],
  bridgePorts: [],
  bridgeVLANs: [],
  bridgeHosts: [],
  bridgeSummary: null,
  routesSubTab: 'routes',
  pppSubTab: 'secrets',
  eoipTunnels: [],
  vxlanTunnels: [],
  vxlanVteps: [],
  pppSecrets: [],
  pppProfiles: [],
  pppActiveSessions: [],
  pppoeServer: null,
  pptpServer: null,
  l2tpServer: null,
  ipsecServer: null,
  ifaceFilter: 'all',
  currentModalIface: null,
  isPolling: false,
  expandedParents: new Set(['eth0']),
  pppoeData: null,
  wgData: null,
  ipsecData: null,
  l2tpData: null,
  pptpData: null,
  fwSummary: null,
  filterRules: [],
  natRules: [],
  mangleRules: [],
  addressLists: [],
  connections: [],
  policyRules: [],
  routingTables: [],
  routingFilters: [],
  filterChainSelected: 'all',
  activeToolsSubTab: 'ping',
  dhcpClients: [],
  dhcpSummary: null,
  dhcpServerTab: 'servers',
  dhcpServers: [],
  dhcpNetworks: [],
  dhcpLeases: [],
  dhcpOptions: [],
  dhcpServerSummary: null
};

const API_BASE = '/api';

function escapeHtml(str) {
  if (str === null || str === undefined) return '';
  return String(str)
    .replace(/&/g, '&')
    .replace(/</g, '&lt;')
    .replace(/>/g, '&gt;')
    .replace(/"/g, '&quot;')
    .replace(/'/g, '&#039;');
}

function formatBytes(bytes) {
  if (bytes === undefined || bytes === null || isNaN(bytes) || bytes === 0) return '0 B';
  const k = 1024;
  const sizes = ['B', 'KB', 'MB', 'GB', 'TB'];
  const i = Math.floor(Math.log(bytes) / Math.log(k));
  if (i < 0 || i >= sizes.length) return `${bytes} B`;
  return `${parseFloat((bytes / Math.pow(k, i)).toFixed(2))} ${sizes[i]}`;
}

// Initialize on page load
document.addEventListener('DOMContentLoaded', async () => {
  initTableSorting();

  // Verify authentication before bootstrapping telemetry and views
  const isAuthenticated = await checkAuthStatus();
  if (isAuthenticated) {
    const hash = window.location.hash.replace('#', '') || 'dashboard';
    navigate(hash);

    // Full state telemetry polling every 5 seconds (smooth & flicker-free)
    if (!window._telemetryInterval) {
      window._telemetryInterval = setInterval(() => {
        if (state.isPolling && state.currentUser && !document.hidden) {
          fetchData(false);
        }
      }, 5000);
    }
  }
});

let trafficEventSource = null;
let trafficPollFallback = null;

function initLiveTrafficStream() {
  if (trafficEventSource) {
    try { trafficEventSource.close(); } catch(e) {}
    trafficEventSource = null;
  }
  if (trafficPollFallback) {
    clearInterval(trafficPollFallback);
    trafficPollFallback = null;
  }

  if (window.EventSource) {
    try {
      trafficEventSource = new EventSource(`${API_BASE}/interfaces/traffic/stream`);
      trafficEventSource.onmessage = (event) => {
        try {
          const data = JSON.parse(event.data);
          updateLiveInterfaceTraffic(data);
        } catch (e) {
          console.error('Error parsing live traffic event:', e);
        }
      };
      trafficEventSource.onerror = () => {
        // Fallback polling if SSE disconnects
        if (!trafficPollFallback) {
          trafficPollFallback = setInterval(pollLiveTrafficSnapshot, 1000);
        }
      };
      trafficEventSource.onopen = () => {
        if (trafficPollFallback) {
          clearInterval(trafficPollFallback);
          trafficPollFallback = null;
        }
      };
      return;
    } catch (e) {
      console.warn('EventSource failed, using 1s polling fallback:', e);
    }
  }

  // Fallback if EventSource is unavailable
  trafficPollFallback = setInterval(pollLiveTrafficSnapshot, 1000);
}

async function pollLiveTrafficSnapshot() {
  try {
    const res = await fetch(`${API_BASE}/interfaces/traffic/rates`);
    if (res.ok) {
      const data = await res.json();
      updateLiveInterfaceTraffic(data);
    }
  } catch (e) {}
}

function updateLiveInterfaceTraffic(data) {
  if (!data || !data.interfaces) return;
  state.latestTraffic = data;

  // 1. Update Top & Dashboard Total Bandwidth Indicators
  const rxHuman = data.total_rx_human || '0 B/s';
  const txHuman = data.total_tx_human || '0 B/s';
  const statRx = document.getElementById('stat-traffic-rx');
  if (statRx && statRx.innerText !== rxHuman) statRx.innerText = rxHuman;
  const statTx = document.getElementById('stat-traffic-tx');
  if (statTx && statTx.innerText !== txHuman) statTx.innerText = txHuman;

  // 2. Update state.interfaces rates in-memory
  if (Array.isArray(state.interfaces)) {
    state.interfaces.forEach(i => {
      const live = data.interfaces[i.name];
      if (live) {
        i.rate = {
          rx_bytes_sec: live.rx_bytes_sec,
          tx_bytes_sec: live.tx_bytes_sec,
          rx_human: live.rx_human,
          tx_human: live.tx_human
        };
        i.stats = {
          rx_bytes: live.rx_bytes,
          tx_bytes: live.tx_bytes,
          rx_packets: live.rx_packets,
          tx_packets: live.tx_packets,
          rx_errors: live.rx_errors,
          tx_errors: live.tx_errors,
          rx_dropped: live.rx_dropped,
          tx_dropped: live.tx_dropped
        };
      }
    });
  }

  // 3. Update all live UI rate spans in-place (ZERO flicker)
  Object.keys(data.interfaces).forEach(name => {
    const live = data.interfaces[name];

    // Dashboard Port Matrix Card
    const cardRate = document.getElementById(`port-card-rate-${name}`);
    if (cardRate && cardRate.innerText !== live.rx_human) {
      cardRate.innerText = live.rx_human;
    }

    // Dashboard Quick Interfaces Table
    const quickRx = document.getElementById(`quick-rx-${name}`);
    if (quickRx) quickRx.innerText = `↓ ${live.rx_human}`;
    const quickTx = document.getElementById(`quick-tx-${name}`);
    if (quickTx) quickTx.innerText = `↑ ${live.tx_human}`;

    // Main Interfaces Tree Table
    const ifaceRx = document.getElementById(`iface-rate-rx-${name}`);
    if (ifaceRx) ifaceRx.innerText = `↓ ${live.rx_human}`;
    const ifaceTx = document.getElementById(`iface-rate-tx-${name}`);
    if (ifaceTx) ifaceTx.innerText = `↑ ${live.tx_human}`;

    // VLAN Sub-interfaces Table
    const vlanRx = document.getElementById(`vlan-rate-rx-${name}`);
    if (vlanRx) vlanRx.innerText = `↓ ${live.rx_human}`;
    const vlanTx = document.getElementById(`vlan-rate-tx-${name}`);
    if (vlanTx) vlanTx.innerText = `↑ ${live.tx_human}`;

    // VLAN Page Table
    const vlanPageRx = document.getElementById(`vlan-page-rate-rx-${name}`);
    if (vlanPageRx) vlanPageRx.innerText = `↓ ${live.rx_human}`;
    const vlanPageTx = document.getElementById(`vlan-page-rate-tx-${name}`);
    if (vlanPageTx) vlanPageTx.innerText = `↑ ${live.tx_human}`;
  });
}

// Navigation Handler
function navigate(tabName) {
  if (tabName === 'dynamic-routing' || tabName === 'routing') {
    navigate('bgp');
    return;
  }
  if (tabName === 'vlans') {
    navigate('interfaces');
    return;
  }
  if (tabName === 'persistence') {
    navigate('dashboard');
    return;
  }

  stopFwStatPolling();
  stopNATStatPolling();
  stopMangleStatPolling();
  state.activeTab = tabName;
  window.location.hash = tabName;

  // Update nav links styling
  document.querySelectorAll('.nav-link').forEach(link => {
    link.className = 'nav-link flex items-center justify-between px-3 py-2 rounded-lg text-xs font-medium transition-all group text-slate-300 hover:bg-slate-800/80 hover:text-white';
  });

  const activeNav = document.getElementById(`nav-${tabName}`);
  if (activeNav) {
    activeNav.className = 'nav-link flex items-center justify-between px-3 py-2 rounded-lg text-xs font-medium transition-all group bg-brand-500/10 text-brand-400 border border-brand-500/20';
  }

  // Update page headers
  const titles = {
    dashboard: { title: 'Dashboard Overview', sub: 'Live router performance and network telemetry' },
    interfaces: { title: 'Network Interfaces', sub: 'Interface Table View' },
    'dhcp-client': { title: 'DHCP Client', sub: 'DHCP Client List' },
    'dhcp-server': { title: 'DHCP Server & Subnets', sub: 'DHCP Server instances, subnet networks (NTP, TFTP, DNS), dynamic leases & static reservations' },
    bridge: { title: 'Bridge Interfaces', sub: 'IEEE 802.1D / 802.1Q VLAN-aware Layer 2 switching, RSTP & hardware forwarding (FDB)' },
    vlans: { title: 'VLAN Virtual Networks', sub: 'IEEE 802.1Q sub-interface segmentation and routing' },
    firewall: { title: 'Network Firewall', sub: 'Stateful packet inspection, NAT, traffic mangle, address lists & connection tracking' },
    routes: { title: 'Routing & Policy', sub: 'Routing tables, static routes (DAS/DAC), and policy routing rules' },
    bgp: { title: 'BGP Dynamic Routing', sub: 'BGP multi-instance peering sessions, advertised networks, and routing table (RIB)' },
    ospf: { title: 'OSPF Dynamic Routing', sub: 'OSPFv2 link-state routing, dynamic neighbor adjacencies, and multi-area topology' },
    'routing-filters': { title: 'Routing Policy Filters', sub: 'Route filter chains, prefix matching, BGP community maps & policy-based path control' },
    'dynamic-routing': { title: 'BGP Dynamic Routing', sub: 'Dynamic routing engine and peering sessions' },
    ppp: { title: 'PPP Servers & Secrets', sub: 'Subscriber authentication, dynamic IP pools and VPN access concentrators' },
    eoip: { title: 'EoIP Tunnels', sub: 'Ethernet over IP (EoIP / GRETAP) Layer 2 encapsulation & transparent network bridging' },
    vxlan: { title: 'VXLAN Tunnels', sub: 'Virtual Extensible LAN (RFC 7348) Layer 2 overlay networks and static VTEPs' },
    aerotun: { title: 'AeroTUN High-Speed VPN', sub: 'Layer 3 encrypted tunnel with XChaCha20-Poly1305 and adaptive LZ4 compression' },
    pppoe: { title: 'PPPoE Client WAN', sub: 'Point-to-Point Protocol over Ethernet WAN access' },
    wireguard: { title: 'WireGuard VPN', sub: 'High-performance cryptographic Layer 3 tunnels with ChaCha20-Poly1305 key exchange' },
    ipsec: { title: 'IPSec (IKEv2) strongSwan', sub: 'Enterprise Site-to-Site & Roadwarrior IPSec controller' },
    l2tp: { title: 'L2TP VPN Client', sub: 'Layer 2 Tunneling Protocol via xl2tpd' },
    pptp: { title: 'PPTP VPN Client', sub: 'Point-to-Point Tunneling Protocol with MPPE-128 encryption' },
    vrrp: { title: 'VRRP High Availability', sub: 'Virtual Router Redundancy Protocol, active-backup gateway failover & Virtual IP (VIP) routing' },
    bwtest: { title: 'Bandwidth Test Benchmark', sub: 'High-speed line-rate throughput benchmark, token-bucket rate limiting, loss & jitter telemetry' },
    tools: { title: 'Diagnostic & Troubleshooting Tools', sub: 'Network latency analysis, ICMP/MTR telemetry, path tracing, DNS resolution and TCP probing' },
    settings: { title: 'Router Settings & DNS', sub: 'System DNS forwarder, upstream resolvers, static host mappings, and appliance identity' },
    users: { title: 'Local User Manager', sub: 'Manage local system administrator credentials and access permissions' },
    certificates: { title: 'Certificates & SSL/TLS', sub: 'Root Certificate Authorities (CA), Server/Client certificates and automated Let\'s Encrypt' },
    reverse_proxy: { title: 'Reverse Proxy & Gateway', sub: 'HTTP/HTTPS Path Routing, Domain Forwarding & SSL Termination' },
    services: { title: 'Management Services', sub: 'Enable or disable Web, SSH, and Telnet management listeners and listening ports' },
    updates: { title: 'Git Updates', sub: 'Check, install and restore appliance software' },
    logs: { title: 'System Activity Logs', sub: 'Real-time circular buffer log viewer and topic-based event monitoring' }
  };

  const header = titles[tabName] || titles.dashboard;
  const pTitle = document.getElementById('page-title');
  if (pTitle) pTitle.innerText = header.title;
  const pSub = document.getElementById('page-subtitle');
  if (pSub) pSub.innerText = header.sub;

  // Toggle sections dynamically for all section elements
  document.querySelectorAll('main section[id^="section-"]').forEach(el => {
    if (el.id === `section-${tabName}`) {
      el.classList.remove('hidden');
    } else {
      el.classList.add('hidden');
    }
  });

  if (tabName === 'interfaces') {
    loadRoles();
    if (state.activeIfaceSubTab === 'roles') switchIfaceSubTab('roles');
    else switchIfaceSubTab('tree');
  }
  if (tabName === 'bridge') loadBridge();
  if (tabName === 'firewall') loadFirewall();
  if (tabName === 'routes') loadRoutes();
  if (tabName === 'bgp') {
    loadDynamicRouting();
    switchBgpSubTab(state.activeBgpSubTab || 'bgp-peers');
  }
  if (tabName === 'ospf') {
    loadDynamicRouting();
    switchOspfTab(state.activeOspfTab || 'instances');
  }
  if (tabName === 'routing-filters') loadDynamicRouting();
  if (tabName === 'dynamic-routing') loadDynamicRouting();
  if (tabName === 'ppp') loadPPP();
  if (tabName === 'eoip') loadEoIP();
  if (tabName === 'vxlan') loadVXLAN();
  if (tabName === 'aerotun') loadAeroTUN();
  if (tabName === 'pppoe') loadPPPoE();
  if (tabName === 'wireguard') loadWireGuard();
  if (tabName === 'ipsec') loadIPSec();
  if (tabName === 'l2tp') loadL2TP();
  if (tabName === 'pptp') loadPPTP();
  if (tabName === 'tools') loadToolsView();
  if (tabName === 'dhcp-client') loadDHCPClients();
  if (tabName === 'dhcp-server') loadDHCPServer();
  if (tabName === 'vrrp') loadVRRP();
  if (tabName === 'bwtest') loadBwTestView();
  if (tabName === 'settings') loadSettingsData();
  if (tabName === 'users') loadUsers();
  if (tabName === 'certificates') loadCertificates();
  if (tabName === 'reverse_proxy') loadReverseProxy();
  if (tabName === 'services') loadServices();
  if (tabName === 'updates') loadUpdateStatus();
  if (tabName === 'logs') loadLogs();
  setTimeout(initTableSorting, 50);
}

// Fetch all core system, network and VPN telemetry
function fetchData(isManual = false) {
  if (coreRefreshPromise) return coreRefreshPromise;
  coreRefreshPromise = refreshCoreData(isManual).finally(() => { coreRefreshPromise = null; });
  return coreRefreshPromise;
}

async function refreshCoreData(isManual = false) {
  const spinner = document.getElementById('refresh-spinner');
  if (isManual && spinner) spinner.classList.add('animate-spin');

  try {
    const refreshSummaries = isManual || Date.now() - lastSummaryRefresh > 30000;
    const summaryFetch = path => (refreshSummaries || (state.activeTab === 'interfaces' && ['/vlans', '/roles'].includes(path))) ? fetch(`${API_BASE}${path}`).catch(() => ({ ok: false })) : Promise.resolve({ ok: false });
    const [statusRes, ifacesRes, vlansRes, vpnRes, fwRes, dynRes, brSummaryRes, dhcpSumRes, dhcpClientsRes, vrrpSumRes, rolesRes] = await Promise.all([
      fetch(`${API_BASE}/system/status`).catch(() => ({ ok: false })),
      fetch(`${API_BASE}/interfaces`).catch(() => ({ ok: false })),
      summaryFetch('/vlans'),
      summaryFetch('/vpn/status'),
      summaryFetch('/firewall/summary'),
      summaryFetch('/routing/dynamic/summary'),
      summaryFetch('/bridge/summary'),
      summaryFetch('/dhcp/clients/summary'),
      summaryFetch('/dhcp/clients'),
      summaryFetch('/vrrp/summary').catch(() => null),
      summaryFetch('/roles').catch(() => null)
    ]);

    if (refreshSummaries && [vlansRes, vpnRes, fwRes, dynRes, brSummaryRes, dhcpSumRes, dhcpClientsRes, vrrpSumRes, rolesRes].every(r => r && r.ok)) lastSummaryRefresh = Date.now();

    if (rolesRes && rolesRes.ok) {
      state.roles = await rolesRes.json();
      const countEl = document.getElementById('badge-roles-count');
      if (countEl) countEl.innerText = (state.roles || []).length;
    }

    if (vrrpSumRes && vrrpSumRes.ok) {
      state.vrrpSummary = await vrrpSumRes.json();
      renderVRRPSummary();
    }

    if (dhcpSumRes && dhcpSumRes.ok) {
      state.dhcpSummary = await dhcpSumRes.json();
      const bDhcp = document.getElementById('badge-dhcp-client-count');
      if (bDhcp) bDhcp.innerText = state.dhcpSummary?.total_clients || 0;
    }
    if (dhcpClientsRes && dhcpClientsRes.ok) {
      state.dhcpClients = await dhcpClientsRes.json();
    }

    if (brSummaryRes.ok) {
      state.bridgeSummary = await brSummaryRes.json();
      const bBridge = document.getElementById('badge-bridge-count');
      if (bBridge) bBridge.innerText = state.bridgeSummary?.bridges_count || 0;
      const sBr = document.getElementById('bridge-stat-bridges');
      if (sBr) sBr.innerText = state.bridgeSummary?.bridges_count || 0;
      const sPorts = document.getElementById('bridge-stat-ports');
      if (sPorts) sPorts.innerText = state.bridgeSummary?.ports_count || 0;
      const sHosts = document.getElementById('bridge-stat-hosts');
      if (sHosts) sHosts.innerText = state.bridgeSummary?.hosts_count || 0;
    }

    if (statusRes.ok) state.systemStatus = await statusRes.json();
    if (ifacesRes.ok) {
      const ifacesData = await ifacesRes.json();
      const rawIfaces = Array.isArray(ifacesData) ? ifacesData : [];
      state.interfaces = rawIfaces.filter(i => {
        if (!i.name) return false;
        if (i.name.startsWith('ep_')) return false;
        return !['gre0', 'gretap0', 'erspan0', 'sit0', 'tunl0', 'ip6tnl0', 'ip6gre0', 'ip6erspan0'].includes(i.name);
      });
      try { populateToolsInterfaces(); } catch (e) {}
    }
    if (vlansRes.ok) {
      const vlansData = await vlansRes.json();
      state.vlans = Array.isArray(vlansData) ? vlansData : [];
    }
    if (vpnRes.ok) state.vpnStatus = await vpnRes.json();
    if (fwRes && fwRes.ok) state.fwSummary = await fwRes.json();
    if (dynRes && dynRes.ok) state.dynSummary = await dynRes.json();

    updateSystemMetrics();
    updateBadges();

    if (state.activeTab === 'dashboard') renderDashboard();
    if (state.activeTab === 'interfaces') {
      if (state.activeIfaceSubTab === 'roles') renderRolesTable();
      else renderInterfacesList();
    }
    if (state.activeTab === 'vlans') renderVlansList();
    if (state.activeTab === 'firewall') await loadFirewall(false);
    if (state.activeTab === 'routes') await loadRoutes(false);
    if (state.activeTab === 'dynamic-routing' || state.activeTab === 'bgp' || state.activeTab === 'ospf') await loadDynamicRouting(false);
    if (state.activeTab === 'ppp') await loadPPP(false);
    if (state.activeTab === 'eoip') await loadEoIP(false);
    if (state.activeTab === 'vxlan') await loadVXLAN(false);
    if (state.activeTab === 'aerotun') await loadAeroTUN(false);
    if (state.activeTab === 'pppoe') await loadPPPoE(false);
    if (state.activeTab === 'wireguard') await loadWireGuard(false);
    if (state.activeTab === 'ipsec') await loadIPSec(false);
    if (state.activeTab === 'l2tp') await loadL2TP(false);
    if (state.activeTab === 'pptp') await loadPPTP(false);
    if (state.activeTab === 'dhcp-client') await loadDHCPClients(false);
    if (state.activeTab === 'dhcp-server') await loadDHCPServer(false);
    if (state.activeTab === 'vrrp') await loadVRRP(false);
    if (state.activeTab === 'settings') await loadSettingsData(false);
    if (state.activeTab === 'users') await loadUsers(false);
    if (state.activeTab === 'certificates') await loadCertificates(false);
    if (state.activeTab === 'reverse_proxy') await loadReverseProxy(false);
    if (state.activeTab === 'services') await loadServices(false);
    if (state.activeTab === 'updates') await loadUpdateStatus(false);
    if (state.activeTab === 'bwtest') await fetchBwTestServerStatus();

  } catch (err) {
    console.error('Failed to fetch router state:', err);
  } finally {
    if (isManual && spinner) {
      setTimeout(() => spinner.classList.remove('animate-spin'), 300);
    }
  }
}

// Update Top KPI and Sidebar Telemetry
function updateSystemMetrics() {
  const s = state.systemStatus;
  const v = state.vpnStatus;
  if (!s) return;

  // Sidebar Host & Uptime
  const sideHost = document.getElementById('side-hostname');
  if (sideHost) sideHost.innerText = s.hostname || 'debian-lxc';
  const sideUp = document.getElementById('side-uptime');
  if (sideUp) sideUp.innerText = s.uptime_human || '0m';
  const sideGw = document.getElementById('side-gateway-ip');
  if (sideGw) sideGw.innerText = s.default_gateway ? `GW: ${s.default_gateway}` : 'GW: Isolated';

  // Compute CPU Metrics
  let cpuPct = 0;
  if (s.cpu_pct !== undefined) {
    cpuPct = s.cpu_pct;
  } else if (s.cpu_load && s.cpu_load.length > 0) {
    const cores = s.cpu_cores || 1;
    cpuPct = Math.min(100, Math.round((parseFloat(s.cpu_load[0]) / cores) * 100));
  }
  const cpuPctStr = `${cpuPct.toFixed(1)}%`;
  const cpuWidth = `${Math.max(3, Math.min(100, cpuPct))}%`;
  const loadStr = s.cpu_load ? s.cpu_load.join(', ') : '-';

  // Sidebar CPU
  const sideCpuVal = document.getElementById('side-cpu-val');
  if (sideCpuVal) sideCpuVal.innerText = cpuPctStr;
  const sideCpuBar = document.getElementById('side-cpu-bar');
  if (sideCpuBar) {
    sideCpuBar.style.width = cpuWidth;
    sideCpuBar.title = `Container: ${cpuPctStr} | Host Loadavg: ${loadStr} (${s.cpu_cores || 1} cores)`;
  }

  // Dashboard CPU Card
  const dashCpuVal = document.getElementById('dash-cpu-val');
  if (dashCpuVal) dashCpuVal.innerText = cpuPctStr;
  const dashCpuBar = document.getElementById('dash-cpu-bar');
  if (dashCpuBar) {
    dashCpuBar.style.width = cpuWidth;
    if (cpuPct > 85) {
      dashCpuBar.className = 'h-full rounded-full bg-rose-500 transition-all duration-500';
    } else if (cpuPct > 65) {
      dashCpuBar.className = 'h-full rounded-full bg-amber-500 transition-all duration-500';
    } else {
      dashCpuBar.className = 'h-full rounded-full bg-emerald-500 transition-all duration-500';
    }
  }
  const dashCpuCores = document.getElementById('dash-cpu-cores');
  if (dashCpuCores) dashCpuCores.innerText = `${s.cpu_cores || 1} Cores`;
  const dashCpuLoad = document.getElementById('dash-cpu-load');
  if (dashCpuLoad) dashCpuLoad.innerText = loadStr;
  const dashCpuStatus = document.getElementById('dash-cpu-status');
  if (dashCpuStatus) {
    if (cpuPct > 85) {
      dashCpuStatus.innerText = 'High';
      dashCpuStatus.className = 'text-[11px] font-semibold text-rose-400 uppercase px-2 py-0.5 rounded bg-rose-500/10';
    } else if (cpuPct > 65) {
      dashCpuStatus.innerText = 'Heavy';
      dashCpuStatus.className = 'text-[11px] font-semibold text-amber-400 uppercase px-2 py-0.5 rounded bg-amber-500/10';
    } else {
      dashCpuStatus.innerText = 'Normal';
      dashCpuStatus.className = 'text-[11px] font-semibold text-emerald-400 uppercase px-2 py-0.5 rounded bg-emerald-500/10';
    }
  }

  // Compute RAM Metrics
  const memPct = Math.round(s.mem_usage_pct || 0);
  const memPctStr = `${memPct}%`;
  const memWidth = `${Math.max(3, Math.min(100, memPct))}%`;
  const usedMB = s.mem_used_mb || 0;
  const totalMB = s.mem_total_mb || 0;
  const freeMB = totalMB > usedMB ? totalMB - usedMB : 0;

  function fmtMemMB(mb) {
    if (mb >= 1024) {
      return `${(mb / 1024).toFixed(1)} GB`;
    }
    return `${mb} MB`;
  }

  // Sidebar RAM
  const sideRamVal = document.getElementById('side-ram-val');
  if (sideRamVal) sideRamVal.innerText = memPctStr;
  const sideRamBar = document.getElementById('side-ram-bar');
  if (sideRamBar) sideRamBar.style.width = memWidth;

  // Dashboard RAM Card
  const dashRamVal = document.getElementById('dash-ram-val');
  if (dashRamVal) dashRamVal.innerText = memPctStr;
  const dashRamBar = document.getElementById('dash-ram-bar');
  if (dashRamBar) {
    dashRamBar.style.width = memWidth;
    if (memPct > 85) {
      dashRamBar.className = 'h-full rounded-full bg-rose-500 transition-all duration-500';
    } else if (memPct > 70) {
      dashRamBar.className = 'h-full rounded-full bg-amber-500 transition-all duration-500';
    } else {
      dashRamBar.className = 'h-full rounded-full bg-indigo-500 transition-all duration-500';
    }
  }
  const dashRamUsedTotal = document.getElementById('dash-ram-used-total');
  if (dashRamUsedTotal) {
    dashRamUsedTotal.innerText = `${fmtMemMB(usedMB)} / ${fmtMemMB(totalMB)}`;
  }
  const dashRamFree = document.getElementById('dash-ram-free');
  if (dashRamFree) {
    dashRamFree.innerText = fmtMemMB(freeMB);
  }
  const dashRamStatus = document.getElementById('dash-ram-status');
  if (dashRamStatus) {
    if (memPct > 85) {
      dashRamStatus.innerText = 'High';
      dashRamStatus.className = 'text-[11px] font-semibold text-rose-400 uppercase px-2 py-0.5 rounded bg-rose-500/10';
    } else {
      dashRamStatus.innerText = 'Active';
      dashRamStatus.className = 'text-[11px] font-semibold text-indigo-400 uppercase px-2 py-0.5 rounded bg-indigo-500/10';
    }
  }

  // Legacy Dashboard Stats (Safe checks)
  const elIfacesUp = document.getElementById('stat-ifaces-up');
  if (elIfacesUp) elIfacesUp.innerText = s.up_ifaces || 0;
  const elIfacesTot = document.getElementById('stat-ifaces-total');
  if (elIfacesTot) elIfacesTot.innerText = `${s.total_ifaces || 0} Total`;
  const elIfacesDown = document.getElementById('stat-ifaces-down');
  if (elIfacesDown) elIfacesDown.innerText = `${s.down_ifaces || 0} DOWN`;
  const elVlans = document.getElementById('stat-vlans-count');
  if (elVlans) elVlans.innerText = s.vlan_ifaces || 0;

  // VPN Status Indicators
  if (v) {
    const totalActive = v.total_active_tunnels || 0;
    const statVpnActive = document.getElementById('stat-vpn-active');
    if (statVpnActive) statVpnActive.innerText = totalActive;

    const tunnelsDot = document.getElementById('tunnels-dot');
    const tunnelsLabel = document.getElementById('tunnels-label');
    if (tunnelsDot && tunnelsLabel) {
      if (totalActive > 0) {
        tunnelsDot.className = 'w-2 h-2 rounded-full bg-emerald-400 animate-pulse';
        tunnelsLabel.innerText = `${totalActive} Active VPN Tunnel${totalActive > 1 ? 's' : ''}`;
      } else {
        tunnelsDot.className = 'w-2 h-2 rounded-full bg-slate-500';
        tunnelsLabel.innerText = '0 Active VPN Tunnels';
      }
    }

    setDotBadge('badge-pppoe-status', (v.active_pppoe || 0) > 0 || v.pppoe_connected);
    setDotBadge('badge-wg-status', (v.active_wireguard || 0) > 0 || v.wireguard_active);
    setDotBadge('badge-ipsec-status', (v.active_ipsec || 0) > 0 || v.ipsec_active);
    setDotBadge('badge-l2tp-status', (v.active_l2tp || 0) > 0 || v.l2tp_connected);
    setDotBadge('badge-pptp-status', (v.active_pptp || 0) > 0 || v.pptp_connected);
  }

  // Total Live Bandwidth Rate
  let totalRx = 0;
  let totalTx = 0;
  (state.interfaces || []).forEach(i => {
    if (i.rate) {
      totalRx += i.rate.rx_bytes_sec || 0;
      totalTx += i.rate.tx_bytes_sec || 0;
    }
  });

  document.getElementById('stat-traffic-rx').innerText = formatTraffic(totalRx);
  document.getElementById('stat-traffic-tx').innerText = formatTraffic(totalTx);
}

function setDotBadge(id, active) {
  const el = document.getElementById(id);
  if (!el) return;
  if (active) {
    el.className = 'w-2 h-2 rounded-full bg-emerald-400 shadow-sm shadow-emerald-400/80';
  } else {
    el.className = 'w-2 h-2 rounded-full bg-slate-600';
  }
}

function updateBadges() {
  const bIfaces = document.getElementById('badge-ifaces-count');
  if (bIfaces) bIfaces.innerText = (state.interfaces || []).length;
  const bVlans = document.getElementById('badge-vlans-count');
  if (bVlans) bVlans.innerText = (state.vlans || []).length;
  if (state.fwSummary) {
    const totalFwRules = (state.fwSummary.filter_rules_count || 0) + (state.fwSummary.nat_rules_count || 0) + (state.fwSummary.mangle_rules_count || 0);
    const badgeFw = document.getElementById('badge-firewall-count');
    if (badgeFw) badgeFw.innerText = totalFwRules;
  }
  if (state.vpnStatus) {
    const v = state.vpnStatus;
    const bEoIP = document.getElementById('badge-eoip-count');
    if (bEoIP) bEoIP.innerText = v.total_eoip || 0;
    const bVXLAN = document.getElementById('badge-vxlan-count');
    if (bVXLAN) bVXLAN.innerText = v.total_vxlan || 0;
    const bAero = document.getElementById('badge-aerotun-count');
    if (bAero) bAero.innerText = v.total_aerotun || 0;
    const bPPPSess = document.getElementById('badge-ppp-sessions');
    if (bPPPSess) bPPPSess.innerText = v.total_ppp_sessions || 0;
    setDotBadge('badge-pppoe-status', v.active_pppoe > 0 || v.pppoe_server_running);
    setDotBadge('badge-wg-status', v.active_wireguard > 0);
    setDotBadge('badge-ipsec-status', v.active_ipsec > 0 || v.ipsec_server_running);
    setDotBadge('badge-l2tp-status', v.active_l2tp > 0 || v.l2tp_server_running);
    setDotBadge('badge-pptp-status', v.active_pptp > 0 || v.pptp_server_running);
  }
  if (state.dynSummary) {
    const d = state.dynSummary;
    setDotBadge('badge-bgp-dot', d.bgp_running);
    setDotBadge('badge-ospf-dot', d.ospf_running);
    const bBgp = document.getElementById('badge-bgp-count');
    if (bBgp) bBgp.innerText = (state.bgpPeers || []).length;
    const bOspf = document.getElementById('badge-ospf-count');
    if (bOspf) bOspf.innerText = (state.ospfInterfaces || []).length;
    const bFilters = document.getElementById('badge-filters-count');
    if (bFilters) bFilters.innerText = (state.routingFilters || []).length;
  }
  const bDhcpServer = document.getElementById('badge-dhcp-server-count');
  if (bDhcpServer) {
    bDhcpServer.innerText = state.dhcpServerSummary ? (state.dhcpServerSummary.active_leases || state.dhcpServerSummary.total_servers || 0) : (state.dhcpServers || []).length;
  }
}

// Render Dashboard View
function renderDashboard() {
  const matrix = document.getElementById('port-matrix');
  if (!matrix) return;

  const ifaces = state.interfaces || [];
  const sig = ifaces.map(i => `${i.name}:${i.state}:${(i.ipv4 || []).join(',')}:${i.type}:${i.is_vlan}`).join(';');
  if (matrix.dataset.sig === sig) {
    return; // Structure & link states haven't changed! Do not rebuild or flicker!
  }
  matrix.dataset.sig = sig;
  matrix.innerHTML = '';

  (state.interfaces || []).forEach(iface => {
    const isUp = iface.state === 'UP';
    const isVlan = iface.is_vlan;

    const portCard = document.createElement('div');
    portCard.className = `p-3 rounded-xl border transition-all cursor-pointer select-none group ${
      isUp
        ? (isVlan ? 'bg-cyan-950/20 border-cyan-800/60 hover:border-cyan-500' : 'bg-slate-800/80 border-slate-700/80 hover:border-brand-500')
        : 'bg-slate-900/40 border-slate-800/60 opacity-60 hover:opacity-100 hover:border-slate-700'
    }`;
    portCard.onclick = () => openIfaceModal(iface.name);

    let statusPillClass = isUp ? 'bg-emerald-500 shadow-sm shadow-emerald-500/50' : 'bg-rose-500';
    if (isVlan) statusPillClass = isUp ? 'bg-cyan-400 shadow-sm shadow-cyan-400/50' : 'bg-rose-500';

    portCard.innerHTML = `
      <div class="flex items-center justify-between mb-2">
        <span class="font-bold text-xs font-mono text-white group-hover:text-brand-400 transition truncate">${iface.name}</span>
        <span class="w-2 h-2 rounded-full ${statusPillClass}"></span>
      </div>
      <div class="text-[11px] font-mono text-slate-300 truncate">${iface.ipv4 && iface.ipv4.length > 0 ? iface.ipv4[0] : (iface.mac || 'No IP')}</div>
      <div class="mt-2 flex items-center justify-between text-[10px] text-slate-400">
        <span class="uppercase tracking-wider font-semibold">${isVlan ? `VLAN ${iface.vlan_id}` : iface.type}</span>
        <span id="port-card-rate-${iface.name}">${iface.rate?.rx_human || '0 B/s'}</span>
      </div>
    `;
    matrix.appendChild(portCard);
  });

  const ifaceTbody = document.getElementById('quick-interfaces-table');
  if (ifaceTbody) {
    ifaceTbody.innerHTML = '';
    (state.interfaces || []).forEach(i => {
      const isUp = i.state === 'UP';
      const tr = document.createElement('tr');
      tr.className = 'hover:bg-slate-800/40 transition cursor-pointer';
      tr.onclick = () => openIfaceModal(i.name);
      const rxStr = i.rate?.rx_human || '0 B/s';
      const txStr = i.rate?.tx_human || '0 B/s';
      tr.innerHTML = `
        <td class="py-2.5 font-bold text-white flex items-center gap-2">
          <span class="w-2 h-2 rounded-full ${isUp ? 'bg-emerald-400 shadow-sm shadow-emerald-400/50' : 'bg-rose-400'}"></span>
          <span>${i.name}</span>
        </td>
        <td class="py-2.5 text-slate-300 font-sans">
          ${getRoleBadge(i.role || 'LAN')}
        </td>
        <td class="py-2.5 text-slate-400 text-[11px] font-mono">${i.mac || '-'}</td>
        <td class="py-2.5 text-slate-200 font-semibold">${i.ipv4 && i.ipv4.length > 0 ? i.ipv4.join(', ') : '<span class="text-slate-600 font-normal">Unassigned</span>'}</td>
        <td class="py-2.5 text-slate-300 text-[11px] font-mono">
          <span id="quick-rx-${i.name}" class="text-emerald-400">↓ ${rxStr}</span> <span class="text-slate-600">•</span> <span id="quick-tx-${i.name}" class="text-cyan-400">↑ ${txStr}</span>
        </td>
        <td class="py-2.5 text-right font-sans font-semibold">
          <span class="px-2 py-0.5 rounded text-[10px] ${isUp ? 'bg-emerald-500/10 text-emerald-400 border border-emerald-500/20' : 'bg-rose-500/10 text-rose-400 border border-rose-500/20'}">${i.state}</span>
        </td>
      `;
      ifaceTbody.appendChild(tr);
    });
  }

  const vlanTbody = document.getElementById('quick-vlans-table');
  if (vlanTbody) {
    vlanTbody.innerHTML = '';
  }
}

// Expand / Collapse Handlers
function toggleExpand(parentName) {
  if (state.expandedParents.has(parentName)) {
    state.expandedParents.delete(parentName);
  } else {
    state.expandedParents.add(parentName);
  }
  renderInterfacesList();
}

// VLAN Support Checker: 802.1Q sub-interfaces are only supported on physical ethernet, veth, bridge, bond
function supportsVLAN(iface) {
  if (!iface) return false;
  if (iface.is_vlan) return false;

  const name = (iface.name || '').toLowerCase();
  const type = (iface.type || '').toLowerCase();
  const role = (iface.role || '').toLowerCase();

  // Exclude loopback
  if (name === 'lo' || type === 'loopback' || role === 'loopback') return false;

  // Exclude WireGuard (Layer 3 tunnel, no 802.1Q support)
  if (type === 'wireguard' || name.startsWith('wg')) return false;

  // Exclude PPP / PPPoE
  if (type === 'ppp' || name.startsWith('ppp')) return false;

  // Exclude other Layer 3 tunnels and dummy devices
  if (type === 'dummy' || type === 'gre' || type === 'sit' || type === 'tun' || type === 'tap' ||
      name.startsWith('gre') || name.startsWith('sit') || name.startsWith('ipsec') || name.startsWith('xfrm') || name.startsWith('dummy')) {
    return false;
  }

  // If name already contains a dot, it's already a sub-interface
  if (name.includes('.')) return false;

  return true;
}

// DHCP Client Support Checker: Only broadcast-capable layer-2 interfaces (Ethernet, veth, VLAN, bridge, bond)
function supportsDHCPClient(iface) {
  if (!iface) return false;

  const name = (iface.name || '').toLowerCase();
  const type = (iface.type || '').toLowerCase();
  const role = (iface.role || '').toLowerCase();

  // Exclude loopback
  if (name === 'lo' || type === 'loopback' || role === 'loopback') return false;

  // Exclude WireGuard (Layer 3 point-to-point tunnel, no broadcast/DHCP)
  if (type === 'wireguard' || name.startsWith('wg')) return false;

  // Exclude PPP / PPPoE / L2TP / PPTP tunnels
  if (type === 'ppp' || name.startsWith('ppp') || name.startsWith('l2tp') || name.startsWith('pptp')) return false;

  // Exclude other Layer 3 tunnels and dummy devices
  if (type === 'dummy' || type === 'gre' || type === 'sit' || type === 'tun' || type === 'tap' ||
      name.startsWith('gre') || name.startsWith('sit') || name.startsWith('ipsec') || name.startsWith('xfrm') || name.startsWith('dummy')) {
    return false;
  }

  // Exclude bridge member/slave ports (bridge itself handles IP / DHCP)
  const isBridgePort = (state.bridgePorts || []).some(bp => bp.interface === iface.name);
  if (isBridgePort) return false;

  return true;
}

// Expand / Collapse Handlers
function toggleExpand(parentName) {
  const childVlans = (state.vlans || []).filter(v => v.parent_name === parentName || v.name.startsWith(parentName + '.'));
  if (childVlans.length === 0) {
    // Cannot expand an interface with no VLANs
    state.expandedParents.delete(parentName);
    return;
  }
  if (state.expandedParents.has(parentName)) {
    state.expandedParents.delete(parentName);
  } else {
    state.expandedParents.add(parentName);
  }
  renderInterfacesList();
}

function expandAllIfaces(expand) {
  if (expand) {
    (state.interfaces || []).forEach(i => {
      const hasVlans = (state.vlans || []).some(v => v.parent_name === i.name || v.name.startsWith(i.name + '.'));
      if (!i.is_vlan && hasVlans) state.expandedParents.add(i.name);
    });
  } else {
    state.expandedParents.clear();
  }
  renderInterfacesList();
}

// =========================================================================
// INTERFACE ROLE TAGS MANAGEMENT
// =========================================================================

const ROLE_COLORS = {
  amber:   { bg: 'bg-amber-500/20',   text: 'text-amber-300',   border: 'border-amber-500/30' },
  blue:    { bg: 'bg-blue-500/20',    text: 'text-blue-300',    border: 'border-blue-500/30' },
  cyan:    { bg: 'bg-cyan-500/20',    text: 'text-cyan-300',    border: 'border-cyan-500/30' },
  emerald: { bg: 'bg-emerald-500/20', text: 'text-emerald-300', border: 'border-emerald-500/30' },
  purple:  { bg: 'bg-purple-500/20',  text: 'text-purple-300',  border: 'border-purple-500/30' },
  rose:    { bg: 'bg-rose-500/20',    text: 'text-rose-300',    border: 'border-rose-500/30' },
  indigo:  { bg: 'bg-indigo-500/20',  text: 'text-indigo-300',  border: 'border-indigo-500/30' },
  sky:     { bg: 'bg-sky-500/20',     text: 'text-sky-300',     border: 'border-sky-500/30' },
  slate:   { bg: 'bg-slate-800',      text: 'text-slate-300',   border: 'border-slate-700' }
};

function getRoleBadge(roleName) {
  const name = roleName || 'LAN';
  const role = (state.roles || []).find(r => r.name.toLowerCase() === name.toLowerCase() || r.id.toLowerCase() === name.toLowerCase());
  const colorKey = (role?.color || 'blue').toLowerCase();
  const theme = ROLE_COLORS[colorKey] || ROLE_COLORS.blue;
  return `<span class="px-2 py-0.5 rounded text-[10px] font-semibold ${theme.bg} ${theme.text} border ${theme.border}" title="Role Tag: ${escapeHtml(name)}">${escapeHtml(name)}</span>`;
}

function switchIfaceSubTab(subTab) {
  state.activeIfaceSubTab = subTab;
  const treeTab = document.getElementById('ifaces-subtab-tree');
  const rolesTab = document.getElementById('ifaces-subtab-roles');
  const btnTree = document.getElementById('ifaces-subtab-btn-tree');
  const btnRoles = document.getElementById('ifaces-subtab-btn-roles');

  if (subTab === 'roles') {
    treeTab?.classList.add('hidden');
    rolesTab?.classList.remove('hidden');
    if (btnRoles) {
      btnRoles.className = 'px-3.5 py-1.5 rounded-lg text-xs font-semibold bg-brand-500/10 text-brand-400 border border-brand-500/20 transition flex items-center gap-1.5';
    }
    if (btnTree) {
      btnTree.className = 'px-3.5 py-1.5 rounded-lg text-xs font-medium text-slate-400 hover:text-white hover:bg-slate-800 transition flex items-center gap-1.5';
    }
    loadRoles();
  } else {
    rolesTab?.classList.add('hidden');
    treeTab?.classList.remove('hidden');
    if (btnTree) {
      btnTree.className = 'px-3.5 py-1.5 rounded-lg text-xs font-semibold bg-brand-500/10 text-brand-400 border border-brand-500/20 transition flex items-center gap-1.5';
    }
    if (btnRoles) {
      btnRoles.className = 'px-3.5 py-1.5 rounded-lg text-xs font-medium text-slate-400 hover:text-white hover:bg-slate-800 transition flex items-center gap-1.5';
    }
    renderInterfacesList();
  }
}

async function loadRoles() {
  try {
    const res = await fetch(`${API_BASE}/roles`);
    if (res.ok) {
      state.roles = await res.json();
      const countEl = document.getElementById('badge-roles-count');
      if (countEl) countEl.innerText = (state.roles || []).length;
      renderRolesTable();
      populateRoleSelects();
    }
  } catch (err) {
    console.error('Failed to load role tags:', err);
  }
}

function renderRolesTable() {
  const tbody = document.getElementById('roles-table-body');
  const empty = document.getElementById('roles-empty-state');
  if (!tbody) return;

  const roles = state.roles || [];
  if (roles.length === 0) {
    tbody.innerHTML = '';
    empty?.classList.remove('hidden');
    return;
  }
  empty?.classList.add('hidden');

  const sig = roles.map(r => `${r.id}:${r.name}:${r.color}:${r.description}:${(r.interfaces||[]).join(',')}`).join(';');
  if (tbody.dataset.sig === sig) return;
  tbody.dataset.sig = sig;

  tbody.innerHTML = roles.map(r => {
    const colorKey = (r.color || 'blue').toLowerCase();
    const theme = ROLE_COLORS[colorKey] || ROLE_COLORS.blue;
    const ifaces = Array.isArray(r.interfaces) ? r.interfaces : [];
    const ifacesChips = ifaces.length > 0
      ? ifaces.map(name => `<span onclick="openIfaceModal('${escapeHtml(name)}')" class="cursor-pointer px-2 py-0.5 rounded text-[10px] font-mono bg-slate-800 text-slate-200 border border-slate-700 hover:border-cyan-500 transition mr-1 mb-1 inline-block" title="Click to view/edit ${escapeHtml(name)}">${escapeHtml(name)}</span>`).join('')
      : '<span class="text-slate-600 font-sans text-xs italic">Unassigned (0)</span>';

    return `
      <tr class="hover:bg-slate-800/40 transition">
        <td class="py-3 px-4">
          <span class="px-2.5 py-1 rounded text-xs font-semibold ${theme.bg} ${theme.text} border ${theme.border}">
            ${escapeHtml(r.name)}
          </span>
        </td>
        <td class="py-3 px-4 font-bold text-white font-mono flex items-center gap-2">
          <span>${escapeHtml(r.name)}</span>
          ${r.builtin ? '<span class="text-[9px] px-1.5 py-0.2 rounded bg-slate-800 text-slate-400 border border-slate-700 uppercase font-sans">Builtin</span>' : ''}
        </td>
        <td class="py-3 px-4 font-sans capitalize text-slate-300">
          <span class="inline-flex items-center gap-1.5">
            <span class="w-2 h-2 rounded-full ${theme.bg.replace('/20', '')}"></span>
            <span>${escapeHtml(r.color || 'blue')}</span>
          </span>
        </td>
        <td class="py-3 px-4 font-sans text-slate-400 text-xs">${escapeHtml(r.description || '-')}</td>
        <td class="py-3 px-4 font-sans">
          <div class="flex flex-wrap items-center">
            ${ifacesChips}
          </div>
        </td>
        <td class="py-3 px-4 text-right space-x-2 font-sans whitespace-nowrap">
          <button onclick="openRoleModal('${escapeHtml(r.id)}')"
                  class="text-xs text-cyan-400 hover:text-cyan-300 font-semibold px-2 py-1 rounded hover:bg-slate-800 transition">
            Edit
          </button>
          <button onclick="deleteRoleTag('${escapeHtml(r.id)}', '${escapeHtml(r.name)}')"
                  class="text-xs text-rose-400 hover:text-rose-300 font-semibold px-2 py-1 rounded hover:bg-slate-800 transition">
            Delete
          </button>
        </td>
      </tr>
    `;
  }).join('');
}

function openRoleModal(id = null) {
  const modal = document.getElementById('role-modal');
  if (!modal) return;

  const idInput = document.getElementById('role-modal-id');
  const nameInput = document.getElementById('role-modal-name');
  const colorSelect = document.getElementById('role-modal-color');
  const descInput = document.getElementById('role-modal-desc');
  const title = document.getElementById('role-modal-title');

  if (id) {
    const role = (state.roles || []).find(r => r.id === id);
    if (role) {
      if (title) title.innerText = `Edit Role Tag: ${role.name}`;
      if (idInput) idInput.value = role.id;
      if (nameInput) nameInput.value = role.name;
      if (colorSelect) colorSelect.value = role.color || 'blue';
      if (descInput) descInput.value = role.description || '';
    }
  } else {
    if (title) title.innerText = 'Add Role Tag';
    if (idInput) idInput.value = '';
    if (nameInput) nameInput.value = '';
    if (colorSelect) colorSelect.value = 'blue';
    if (descInput) descInput.value = '';
  }

  updateRoleModalPreview();
  modal.classList.remove('hidden');
}

function closeRoleModal() {
  const modal = document.getElementById('role-modal');
  if (modal) modal.classList.add('hidden');
}

function updateRoleModalPreview() {
  const name = document.getElementById('role-modal-name')?.value.trim() || 'Preview';
  const colorKey = (document.getElementById('role-modal-color')?.value || 'blue').toLowerCase();
  const theme = ROLE_COLORS[colorKey] || ROLE_COLORS.blue;
  const preview = document.getElementById('role-modal-preview');
  if (preview) {
    preview.innerText = name;
    preview.className = `px-2.5 py-1 rounded text-xs font-semibold ${theme.bg} ${theme.text} border ${theme.border}`;
  }
}

async function submitSaveRole(e) {
  e.preventDefault();
  const id = document.getElementById('role-modal-id')?.value;
  const name = document.getElementById('role-modal-name')?.value.trim();
  const color = document.getElementById('role-modal-color')?.value;
  const desc = document.getElementById('role-modal-desc')?.value.trim();

  if (!name) return;

  try {
    const payload = { id, name, color, description: desc };
    const method = id ? 'PUT' : 'POST';
    const url = id ? `${API_BASE}/roles/${encodeURIComponent(id)}` : `${API_BASE}/roles`;

    const res = await fetch(url, {
      method,
      headers: { 'Content-Type': 'application/json' },
      body: JSON.stringify(payload)
    });

    if (res.ok) {
      showToast('Role Tag Saved', `Role tag "${name}" saved successfully`, 'success');
      closeRoleModal();
      await loadRoles();
      fetchData(false);
    } else {
      const err = await res.json();
      showToast('Error', err.error || err.message || 'Failed to save role tag', 'error');
    }
  } catch (err) {
    showToast('Error', err.message, 'error');
  }
}

async function deleteRoleTag(id, name) {
  if (!confirm(`Are you sure you want to delete role tag "${name}"?\nInterfaces assigned to this role will default to LAN.`)) return;

  try {
    const res = await fetch(`${API_BASE}/roles/${encodeURIComponent(id)}`, {
      method: 'DELETE'
    });

    if (res.ok) {
      showToast('Role Tag Deleted', `Role tag "${name}" removed`, 'success');
      await loadRoles();
      fetchData(false);
    } else {
      const err = await res.json();
      showToast('Error', err.error || err.message || 'Failed to delete role tag', 'error');
    }
  } catch (err) {
    showToast('Error', err.message, 'error');
  }
}

function populateRoleSelects(selectedRole = '') {
  const ifaceSelect = document.getElementById('modal-iface-role');
  const vlanSelect = document.getElementById('vlan-role');

  const roles = state.roles || [];
  const optionsHtml = roles.map(r => `<option value="${escapeHtml(r.name)}">${escapeHtml(r.name)}${r.description ? ` (${escapeHtml(r.description)})` : ''}</option>`).join('');

  if (ifaceSelect) {
    const currentVal = selectedRole || ifaceSelect.value || 'LAN';
    if (ifaceSelect.dataset.optionsSig !== optionsHtml) {
      ifaceSelect.innerHTML = optionsHtml;
      ifaceSelect.dataset.optionsSig = optionsHtml;
    }
    if (currentVal) ifaceSelect.value = currentVal;
  }

  if (vlanSelect) {
    const currentVal = selectedRole || vlanSelect.value || 'LAN';
    if (vlanSelect.dataset.optionsSig !== optionsHtml) {
      vlanSelect.innerHTML = optionsHtml;
      vlanSelect.dataset.optionsSig = optionsHtml;
    }
    if (currentVal) vlanSelect.value = currentVal;
  }
}

// Filter and Render Hierarchical Interfaces List
function filterIfaces(filter) {
  state.ifaceFilter = filter || 'all';
  renderInterfacesList();
}

function renderInterfacesList() {
  const tbody = document.getElementById('interfaces-tree-tbody');
  const emptyState = document.getElementById('interfaces-empty-state');
  const summary = document.getElementById('ifaces-list-summary');
  const query = (document.getElementById('iface-search')?.value || '').trim().toLowerCase();

  const allIfaces = state.interfaces || [];
  const allVlans = state.vlans || [];

  const parentIfaces = allIfaces.filter(i => !i.is_vlan);

  const filteredParents = parentIfaces.filter(parent => {
    const childVlans = allVlans.filter(v => v.parent_name === parent.name || v.name.startsWith(parent.name + '.'));

    if (query) {
      const matchName = parent.name.toLowerCase().includes(query);
      const matchIp = (parent.ipv4 || []).some(ip => ip.toLowerCase().includes(query));
      const matchRole = (parent.role || '').toLowerCase().includes(query);
      const matchType = (parent.type || '').toLowerCase().includes(query);
      const matchVlan = childVlans.some(v => 
        v.name.toLowerCase().includes(query) || 
        String(v.vlan_id).includes(query) || 
        (v.ipv4 || []).some(ip => ip.toLowerCase().includes(query)) ||
        (v.description || '').toLowerCase().includes(query)
      );
      if (!matchName && !matchIp && !matchRole && !matchType && !matchVlan) return false;
    }

    if (state.ifaceFilter === 'has_vlans') return childVlans.length > 0;
    if (state.ifaceFilter === 'physical') return parent.type !== 'loopback';
    if (state.ifaceFilter === 'up') return parent.state === 'UP';
    return true;
  });

  if (summary) {
    summary.innerText = `${parentIfaces.length} Interfaces • ${allVlans.length} Active VLANs`;
  }

  if (filteredParents.length === 0) {
    emptyState?.classList.remove('hidden');
    tbody.innerHTML = '';
    return;
  }
  emptyState?.classList.add('hidden');

  const sig = `${state.ifaceFilter}|${query}|` + filteredParents.map(p => {
    const cVlans = allVlans.filter(v => v.parent_name === p.name || v.name.startsWith(p.name + '.'));
    const dhcp = (state.dhcpClients || []).find(dc => dc.interface === p.name);
    return `${p.name}:${p.state}:${p.role||'LAN'}:${(p.ipv4||[]).join(',')}:${p.mtu}:${cVlans.length}:${state.expandedParents.has(p.name)}:${dhcp?.status || ''}`;
  }).join(';');

  if (tbody.dataset.sig === sig) {
    return; // ZERO changes to structure, links, IPs or VLANs! Do not rebuild DOM!
  }
  tbody.dataset.sig = sig;
  tbody.innerHTML = '';

  filteredParents.forEach(parent => {
    const isUp = parent.state === 'UP';
    const childVlans = allVlans.filter(v => v.parent_name === parent.name || v.name.startsWith(parent.name + '.'));
    const hasVlans = childVlans.length > 0;
    const isExpanded = hasVlans && state.expandedParents.has(parent.name);
    const canHaveVlan = supportsVLAN(parent);

    const parentRow = document.createElement('tr');
    parentRow.className = `hover:bg-slate-800/50 transition border-b border-slate-800/80 ${isExpanded ? 'bg-slate-900/80' : ''}`;

    parentRow.innerHTML = `
      <td class="py-3 px-3 text-center">
        ${hasVlans ? `
          <button onclick="toggleExpand('${parent.name}')" title="${isExpanded ? 'Collapse VLANs' : 'Expand VLANs'}"
                  class="w-6 h-6 rounded flex items-center justify-center hover:bg-slate-800 text-slate-400 hover:text-white transition">
            <svg class="w-4 h-4 chevron-icon ${isExpanded ? 'chevron-open text-cyan-400' : 'text-slate-500'}" fill="none" stroke="currentColor" viewBox="0 0 24 24">
              <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2.5" d="M9 5l7 7-7 7" />
            </svg>
          </button>
        ` : `
          <div class="w-6 h-6 flex items-center justify-center text-slate-700 select-none">
            <span class="w-1.5 h-1.5 rounded-full bg-slate-800"></span>
          </div>
        `}
      </td>
      <td class="py-3 px-4">
        <div class="flex items-center space-x-2.5">
          <div class="w-7 h-7 rounded-lg bg-slate-800 border border-slate-700/80 flex items-center justify-center text-[10px] font-bold text-slate-300">
            ${parent.type === 'loopback' ? 'LO' : (parent.type === 'wireguard' ? 'WG' : (parent.type === 'bridge' ? 'BR' : 'NIC'))}
          </div>
          <div>
            <div class="flex items-center gap-2">
              <span class="font-bold text-white text-sm cursor-pointer hover:text-cyan-400 flex items-center gap-1.5" onclick="${hasVlans ? `toggleExpand('${parent.name}')` : `openIfaceModal('${parent.name}')`}" title="${hasVlans ? 'Click to expand VLANs, or click pencil to rename' : 'Click to configure or rename interface'}">
                <span>${parent.name}</span>
                <svg onclick="event.stopPropagation(); openIfaceModal('${parent.name}')" class="w-3.5 h-3.5 text-slate-500 hover:text-cyan-400 opacity-60 hover:opacity-100 cursor-pointer" title="Configure / Rename ${parent.name}" fill="none" stroke="currentColor" viewBox="0 0 24 24"><path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M15.232 5.232l3.536 3.536m-2.036-5.036a2.5 2.5 0 113.536 3.536L6.5 21.036H3v-3.572L16.732 3.732z"/></svg>
              </span>
              ${hasVlans ? `
                <span onclick="toggleExpand('${parent.name}')" class="cursor-pointer text-[10px] bg-cyan-950 text-cyan-400 border border-cyan-800/60 px-2 py-0.5 rounded-full font-bold hover:bg-cyan-900 transition">${childVlans.length} VLAN${childVlans.length > 1 ? 's' : ''}</span>
              ` : `
                <span class="text-[10px] bg-slate-800/40 text-slate-500 px-1.5 py-0.5 rounded font-mono select-none">0 VLANs</span>
              `}
            </div>
            <div class="text-[10px] text-slate-500 font-sans mt-0.5">${parent.type}</div>
          </div>
        </div>
      </td>
      <td class="py-3 px-4 font-sans">
        <div class="flex items-center gap-1.5">
          ${getRoleBadge(parent.role || 'LAN')}
          <span class="text-xs text-slate-400 truncate max-w-[120px]">${parent.description || '-'}</span>
        </div>
      </td>
      <td class="py-3 px-4">
        ${parent.ipv4 && parent.ipv4.length > 0
          ? `<div class="text-white font-medium">${parent.ipv4[0]}</div>`
          : '<span class="text-slate-600 font-sans">Unassigned</span>'
        }
        ${(() => {
          const c = (state.dhcpClients || []).find(dc => dc.interface === parent.name);
          if (!c) return '';
          const statusCls = c.status === 'bound' ? 'bg-amber-500/20 text-amber-300 border-amber-500/30' : (c.status === 'searching' ? 'bg-sky-500/20 text-sky-300 border-sky-500/30' : 'bg-slate-800 text-slate-400 border-slate-700');
          return `<div class="mt-1"><span class="px-1.5 py-0.5 rounded text-[10px] font-mono border ${statusCls} cursor-pointer hover:underline" onclick="navigate('dhcp-client')" title="DHCP Client: ${c.status.toUpperCase()} (${c.ip_address || 'requesting...'})">⚡ DHCP: ${c.status.toUpperCase()}</span></div>`;
        })()}
      </td>
      <td class="py-3 px-4 text-slate-400 text-[11px]">
        <div>${parent.mac || 'N/A'}</div>
        <div class="text-[10px] text-slate-500">MTU ${parent.mtu}</div>
      </td>
      <td class="py-3 px-4 text-[11px]">
        <div class="flex items-center space-x-2">
          <span id="iface-rate-rx-${parent.name}" class="text-emerald-400">↓ ${parent.rate?.rx_human || '0 B/s'}</span>
          <span id="iface-rate-tx-${parent.name}" class="text-cyan-400">↑ ${parent.rate?.tx_human || '0 B/s'}</span>
        </div>
      </td>
      <td class="py-3 px-4 font-sans">
        <button onclick="toggleInterfaceState('${parent.name}', '${isUp ? 'down' : 'up'}')"
                class="flex items-center gap-1.5 text-xs font-semibold px-2.5 py-1 rounded-full transition ${
                  isUp ? 'bg-emerald-500/10 text-emerald-400 border border-emerald-500/30 hover:bg-rose-500/10 hover:text-rose-400 hover:border-rose-500/30' : 'bg-rose-500/10 text-rose-400 border border-rose-500/30 hover:bg-emerald-500/10 hover:text-emerald-400'
                }" title="Click to toggle link status">
          <span class="w-1.5 h-1.5 rounded-full ${isUp ? 'bg-emerald-400' : 'bg-rose-400'}"></span>
          <span>${parent.state}</span>
        </button>
      </td>
      <td class="py-3 px-4 text-right space-x-2 font-sans">
        ${(() => {
          const c = (state.dhcpClients || []).find(dc => dc.interface === parent.name);
          if (c) {
            return `<button onclick="navigate('dhcp-client')" title="Manage DHCP Client (${c.status})" class="text-xs bg-amber-500/10 hover:bg-amber-500/20 text-amber-400 font-medium px-2.5 py-1 rounded-lg border border-amber-500/30 transition">⚡ DHCP</button>`;
          }
          if (!supportsDHCPClient(parent)) {
            return '';
          }
          return `<button onclick="openDHCPClientModalForIface('${parent.name}')" title="Add DHCP Client on ${parent.name}" class="text-xs bg-slate-800/80 hover:bg-slate-700 text-slate-300 hover:text-amber-400 font-medium px-2 py-1 rounded-lg border border-slate-700 transition">+ DHCP</button>`;
        })()}
        ${canHaveVlan ? `
          <button onclick="openVlanModal('${parent.name}')"
                  class="text-xs bg-cyan-950/60 hover:bg-cyan-900 text-cyan-300 font-semibold px-2.5 py-1 rounded-lg border border-cyan-800/70 shadow-sm transition">
            + Add VLAN
          </button>
        ` : ''}
        <button onclick="openIfaceModal('${parent.name}')"
                class="text-xs bg-slate-800 hover:bg-slate-700 text-white font-medium px-2.5 py-1 rounded-lg border border-slate-700 transition">
          Edit
        </button>
      </td>
    `;
    tbody.appendChild(parentRow);

    if (isExpanded) {
      const drawerRow = document.createElement('tr');
      drawerRow.className = 'bg-slate-950/80 border-b border-slate-800/90';

      const drawerCell = document.createElement('td');
      drawerCell.colSpan = 8;
      drawerCell.className = 'p-0';

      drawerCell.innerHTML = `
        <div class="py-4 pl-12 pr-6 border-l-4 border-cyan-500 bg-gradient-to-r from-cyan-950/20 via-slate-900/40 to-transparent">
          <div class="flex items-center justify-between mb-3">
            <div class="flex items-center space-x-3">
              <span class="font-bold text-xs text-white uppercase tracking-wider flex items-center gap-1.5 font-sans">
                <span>VLAN Sub-interfaces on <code class="text-cyan-300 lowercase">${parent.name}</code></span>
              </span>
              <span class="text-[11px] bg-cyan-950 text-cyan-400 px-2 py-0.5 rounded-full border border-cyan-800/60 font-mono">
                ${childVlans.length} Attached
              </span>
            </div>
            <button onclick="openVlanModal('${parent.name}')"
                    class="flex items-center space-x-1.5 text-xs bg-cyan-600 hover:bg-cyan-500 text-white font-semibold px-3 py-1.5 rounded-lg shadow-md shadow-cyan-500/20 transition font-sans">
              <span>+ Create VLAN on ${parent.name}</span>
            </button>
          </div>

          ${childVlans.length === 0 ? `
            <div class="p-6 text-center border border-dashed border-slate-800 rounded-xl bg-slate-900/40 font-sans">
              <p class="text-xs text-slate-400 mb-2">No 802.1Q tagged VLANs have been created under <strong class="text-white">${parent.name}</strong> yet.</p>
              <button onclick="openVlanModal('${parent.name}')" class="inline-flex items-center space-x-1.5 text-xs text-cyan-400 hover:text-cyan-300 bg-cyan-950/60 border border-cyan-800/70 px-3 py-1.5 rounded-lg transition font-medium">
                <span>+ Create Your First VLAN on ${parent.name}</span>
              </button>
            </div>
          ` : `
            <div class="overflow-x-auto rounded-lg border border-slate-800 bg-slate-900/90 shadow-inner">
              <table class="w-full text-left text-xs font-mono">
                <thead class="text-slate-400 bg-slate-950/70 border-b border-slate-800 uppercase tracking-wider text-[10px] font-sans">
                  <tr>
                    <th class="py-2.5 px-4">VLAN ID</th>
                    <th class="py-2.5 px-4">Interface Device</th>
                    <th class="py-2.5 px-4">Subnet Gateway</th>
                    <th class="py-2.5 px-4">Role / Alias</th>
                    <th class="py-2.5 px-4">MTU</th>
                    <th class="py-2.5 px-4">Throughput</th>
                    <th class="py-2.5 px-4">Status</th>
                    <th class="py-2.5 px-4 text-right">Actions</th>
                  </tr>
                </thead>
                <tbody class="divide-y divide-slate-800/70">
                  ${childVlans.map(v => {
                    const isVlanUp = v.state === 'UP';
                    return `
                      <tr class="hover:bg-slate-800/40 transition">
                        <td class="py-2.5 px-4">
                          <span class="px-2 py-0.5 rounded text-xs font-bold bg-cyan-950 text-cyan-300 border border-cyan-800 shadow-sm">
                            VLAN ${v.vlan_id}
                          </span>
                        </td>
                        <td class="py-2.5 px-4 font-bold text-white flex items-center gap-1.5">
                          <span class="text-cyan-500">└─</span>
                          <span class="cursor-pointer hover:text-cyan-400 flex items-center gap-1" onclick="openIfaceModal('${v.name}')" title="Configure / Rename ${v.name}">
                            <span>${v.name}</span>
                            <svg class="w-3 h-3 text-slate-500 hover:text-cyan-400 opacity-60 hover:opacity-100" fill="none" stroke="currentColor" viewBox="0 0 24 24"><path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M15.232 5.232l3.536 3.536m-2.036-5.036a2.5 2.5 0 113.536 3.536L6.5 21.036H3v-3.572L16.732 3.732z"/></svg>
                          </span>
                        </td>
                        <td class="py-2.5 px-4 text-emerald-400 font-medium">
                          ${v.ipv4 && v.ipv4.length > 0 ? v.ipv4[0] : '<span class="text-slate-600 font-sans">Unassigned</span>'}
                          ${(() => {
                            const c = (state.dhcpClients || []).find(dc => dc.interface === v.name);
                            if (!c) return '';
                            const statusCls = c.status === 'bound' ? 'bg-amber-500/20 text-amber-300 border-amber-500/30' : 'bg-slate-800 text-slate-400 border-slate-700';
                            return `<div class="mt-0.5"><span class="px-1.5 py-0.2 rounded text-[9px] font-mono border ${statusCls} cursor-pointer hover:underline" onclick="navigate('dhcp-client')" title="DHCP Client: ${c.status.toUpperCase()}">⚡ DHCP: ${c.status.toUpperCase()}</span></div>`;
                          })()}
                        </td>
                        <td class="py-2.5 px-4 font-sans text-slate-300">
                          <div class="flex items-center gap-1.5">
                            ${getRoleBadge(v.role || 'LAN')}
                            <span class="text-slate-400 text-xs">${v.description || '-'}</span>
                          </div>
                        </td>
                        <td class="py-2.5 px-4 text-slate-400">${v.mtu}</td>
                        <td class="py-2.5 px-4 text-[11px]">
                          <span id="vlan-rate-rx-${v.name}" class="text-emerald-400">↓ ${v.rate?.rx_human || '0 B/s'}</span>
                          <span id="vlan-rate-tx-${v.name}" class="text-cyan-400 ml-1.5">↑ ${v.rate?.tx_human || '0 B/s'}</span>
                        </td>
                        <td class="py-2.5 px-4 font-sans">
                          <button onclick="toggleInterfaceState('${v.name}', '${isVlanUp ? 'down' : 'up'}')"
                                  class="flex items-center gap-1 text-[11px] font-semibold px-2 py-0.5 rounded-full ${
                                    isVlanUp ? 'bg-emerald-500/10 text-emerald-400 border border-emerald-500/30' : 'bg-rose-500/10 text-rose-400 border border-rose-500/30'
                                  }">
                            <span class="w-1.5 h-1.5 rounded-full ${isVlanUp ? 'bg-emerald-400' : 'bg-rose-400'}"></span>
                            <span>${v.state}</span>
                          </button>
                        </td>
                        <td class="py-2.5 px-4 text-right space-x-1.5 font-sans">
                          ${(() => {
                            const c = (state.dhcpClients || []).find(dc => dc.interface === v.name);
                            if (c) {
                              return `<button onclick="navigate('dhcp-client')" class="text-xs text-amber-400 hover:text-amber-300 px-2 py-0.5 rounded bg-amber-950/40 border border-amber-800/50">⚡ DHCP</button>`;
                            }
                            if (!supportsDHCPClient(v)) {
                              return '';
                            }
                            return `<button onclick="openDHCPClientModalForIface('${v.name}')" class="text-xs text-slate-400 hover:text-amber-400 px-1.5 py-0.5 rounded border border-slate-700">+ DHCP</button>`;
                          })()}
                          <button onclick="openIfaceModal('${v.name}')" class="text-xs bg-slate-800 hover:bg-slate-700 text-slate-200 px-2 py-0.5 rounded border border-slate-700">Edit</button>
                          <button onclick="confirmDeleteVlan('${v.name}')" class="text-xs text-rose-400 hover:text-rose-300 hover:bg-rose-950/40 px-2 py-0.5 rounded transition">Delete</button>
                        </td>
                      </tr>
                    `;
                  }).join('')}
                </tbody>
              </table>
            </div>
          `}
        </div>
      `;
      drawerRow.appendChild(drawerCell);
      tbody.appendChild(drawerRow);
    }
  });
}

// Render VLANs Dedicated View
function renderVlansList() {
  const tbody = document.getElementById('vlans-table-body');
  if (!tbody) return;
  const emptyState = document.getElementById('vlans-empty-state');
  const countBadge = document.getElementById('vlans-table-count');
  const query = (document.getElementById('vlan-search')?.value || '').toLowerCase();

  const allVlans = state.vlans || [];
  if (countBadge) countBadge.innerText = allVlans.length;

  const filtered = allVlans.filter(v => {
    if (!query) return true;
    return v.name.toLowerCase().includes(query) ||
           String(v.vlan_id).includes(query) ||
           (v.description || '').toLowerCase().includes(query) ||
           (v.ipv4 && v.ipv4.some(ip => ip.includes(query)));
  });

  if (allVlans.length === 0) {
    emptyState.classList.remove('hidden');
    tbody.innerHTML = '';
    return;
  }
  emptyState.classList.add('hidden');

  const sig = `${query}|` + filtered.map(v => `${v.name}:${v.state}:${(v.ipv4||[]).join(',')}:${v.vlan_id}:${v.mtu}`).join(';');
  if (tbody.dataset.sig === sig) return;
  tbody.dataset.sig = sig;
  tbody.innerHTML = '';

  filtered.forEach(v => {
    const isUp = v.state === 'UP';
    const tr = document.createElement('tr');
    tr.className = 'hover:bg-slate-800/40 transition font-mono text-xs';

    tr.innerHTML = `
      <td class="py-3 px-4">
        <span class="px-2.5 py-1 rounded-md text-xs font-bold bg-cyan-950 text-cyan-300 border border-cyan-800/70 shadow-sm">
          VLAN ${v.vlan_id}
        </span>
      </td>
      <td class="py-3 px-4 font-bold text-white">
        <span class="cursor-pointer hover:text-cyan-400 flex items-center gap-1.5" onclick="openIfaceModal('${v.name}')" title="Configure / Rename ${v.name}">
          <span>${v.name}</span>
          <svg class="w-3.5 h-3.5 text-slate-500 hover:text-cyan-400 opacity-60 hover:opacity-100" fill="none" stroke="currentColor" viewBox="0 0 24 24"><path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M15.232 5.232l3.536 3.536m-2.036-5.036a2.5 2.5 0 113.536 3.536L6.5 21.036H3v-3.572L16.732 3.732z"/></svg>
        </span>
      </td>
      <td class="py-3 px-4 text-slate-300">
        <span class="bg-slate-800 text-slate-200 px-2 py-0.5 rounded text-[11px]">${v.parent_name || 'eth0'}</span>
      </td>
      <td class="py-3 px-4 text-emerald-400 font-medium">
        ${v.ipv4 && v.ipv4.length > 0 ? v.ipv4[0] : '<span class="text-slate-600 font-sans">Unassigned</span>'}
      </td>
      <td class="py-3 px-4 text-slate-300 font-sans">
        <span class="text-slate-400 text-xs">${v.description || v.role || '-'}</span>
      </td>
      <td class="py-3 px-4 text-slate-400">${v.mtu}</td>
      <td class="py-3 px-4 font-sans">
        <button onclick="toggleInterfaceState('${v.name}', '${isUp ? 'down' : 'up'}')"
                class="flex items-center gap-1.5 text-xs font-semibold px-2 py-0.5 rounded-full ${
                  isUp ? 'bg-emerald-500/10 text-emerald-400 border border-emerald-500/30' : 'bg-rose-500/10 text-rose-400 border border-rose-500/30'
                }">
          <span class="w-1.5 h-1.5 rounded-full ${isUp ? 'bg-emerald-400' : 'bg-rose-400'}"></span>
          <span>${v.state}</span>
        </button>
      </td>
      <td class="py-3 px-4 text-right space-x-2 font-sans">
        <button onclick="openIfaceModal('${v.name}')" class="text-xs bg-slate-800 hover:bg-slate-700 text-slate-200 px-2.5 py-1 rounded border border-slate-700">Edit</button>
        <button onclick="confirmDeleteVlan('${v.name}')" class="text-xs text-rose-400 hover:text-rose-300 hover:bg-rose-950/40 px-2 py-1 rounded transition">Delete</button>
      </td>
    `;
    tbody.appendChild(tr);
  });
}

// Toggle interface UP / DOWN
async function toggleInterfaceState(name, newState) {
  try {
    const res = await fetch(`${API_BASE}/interfaces/${encodeURIComponent(name)}/state`, {
      method: 'POST',
      headers: { 'Content-Type': 'application/json' },
      body: JSON.stringify({ state: newState })
    });
    const data = await res.json();
    if (res.ok) {
      showToast('Interface Updated', `Interface ${name} is now ${newState.toUpperCase()}`, 'success');
      fetchData(false);
    } else {
      showToast('Error', data.message || 'Failed to toggle interface state', 'error');
    }
  } catch (err) {
    showToast('Error', err.message, 'error');
  }
}

// ---------------- MikroTik Flag & Utilities ----------------
function renderMikroTikFlag(running, disabled) {
  if (running) {
    return `<span class="inline-flex items-center justify-center w-5 h-5 rounded-md font-mono font-bold text-[11px] bg-emerald-500/20 text-emerald-400 border border-emerald-500/40 shadow-sm" title="Running (Connected)">R</span>`;
  }
  if (disabled) {
    return `<span class="inline-flex items-center justify-center w-5 h-5 rounded-md font-mono font-bold text-[11px] bg-rose-500/20 text-rose-400 border border-rose-500/40 shadow-sm" title="Disabled">X</span>`;
  }
  return `<span class="inline-flex items-center justify-center w-5 h-5 rounded-md font-mono font-bold text-[11px] text-slate-500 bg-slate-800/80 border border-slate-700/60" title="Idle / Disconnected">-</span>`;
}

function copyToClipboard(text, label = 'Text') {
  navigator.clipboard.writeText(text).then(() => {
    showToast('Copied', `${label} copied to clipboard`, 'success');
  }).catch(() => {
    prompt('Copy value:', text);
  });
}

// ======================== PPP Profiles Shared Helper ========================
async function fetchPPPProfilesList() {
  try {
    const res = await fetch(`${API_BASE}/vpn/ppp/profiles`);
    if (res.ok) {
      state.pppProfiles = await res.json();
    }
  } catch (err) {
    console.error('Failed to load PPP profiles:', err);
  }
}

function populateProfileSelect(selectId, selectedVal, defaultVal = 'default') {
  const sel = document.getElementById(selectId);
  if (!sel) return;
  const profiles = (state.pppProfiles && state.pppProfiles.length > 0) ? state.pppProfiles : [
    { name: 'default', use_encryption: 'no' },
    { name: 'default-encryption', use_encryption: 'required' }
  ];

  sel.innerHTML = '';
  profiles.forEach(p => {
    const opt = document.createElement('option');
    opt.value = p.name;
    const encBadge = p.use_encryption === 'required' ? ' (MPPE-128)' : (p.use_encryption === 'yes' ? ' (MPPE)' : '');
    opt.innerText = `${p.name}${encBadge}`;
    sel.appendChild(opt);
  });

  if (selectedVal) {
    sel.value = selectedVal;
  } else {
    sel.value = defaultVal;
  }
  if (!sel.value && sel.options.length > 0) {
    sel.selectedIndex = 0;
  }
}

// ======================== PPPoE Multi-Instance ========================
async function loadPPPoE(populateInputs = true) {
  try {
    if (!state.pppProfiles || state.pppProfiles.length === 0) {
      await fetchPPPProfilesList();
    }
    const res = await fetch(`${API_BASE}/vpn/pppoe/clients`);
    const list = await res.json();
    state.pppoeList = Array.isArray(list) ? list : [];

    const badge = document.getElementById('pppoe-count-badge');
    if (badge) badge.innerText = `${state.pppoeList.length} Interface${state.pppoeList.length !== 1 ? 's' : ''}`;

    const tbody = document.getElementById('pppoe-table-body');
    const empty = document.getElementById('pppoe-empty');
    if (!tbody) return;
    tbody.innerHTML = '';

    if (state.pppoeList.length === 0) {
      if (empty) empty.classList.remove('hidden');
    } else {
      if (empty) empty.classList.add('hidden');
      state.pppoeList.forEach(inst => {
        const tr = document.createElement('tr');
        tr.className = 'hover:bg-slate-800/40 transition text-xs';
        tr.innerHTML = `
          <td class="py-2.5 px-3 text-center">${renderMikroTikFlag(inst.running, inst.disabled)}</td>
          <td class="py-2.5 px-3 font-bold text-white">${escapeHtml(inst.name)}</td>
          <td class="py-2.5 px-3 text-cyan-400 font-mono">${escapeHtml(inst.interface)}</td>
          <td class="py-2.5 px-3 text-slate-300 font-mono">${escapeHtml(inst.username || '-')}</td>
          <td class="py-2.5 px-3 font-mono text-cyan-300"><span class="px-1.5 py-0.5 rounded text-[10px] bg-slate-800 border border-slate-700">${escapeHtml(inst.profile || 'default')}</span></td>
          <td class="py-2.5 px-3 font-mono ${inst.assigned_ip ? 'text-emerald-400 font-bold' : 'text-slate-500'}">${escapeHtml(inst.assigned_ip || '-')}</td>
          <td class="py-2.5 px-3 text-slate-400 font-mono">${escapeHtml(inst.ppp_device || '-')}</td>
          <td class="py-2.5 px-3 text-center">
            <span class="px-2 py-0.5 rounded text-[10px] font-sans ${inst.default_route ? 'bg-blue-500/20 text-blue-300 border border-blue-500/30' : 'bg-slate-800 text-slate-500'}">
              ${inst.default_route ? 'Yes' : 'No'}
            </span>
          </td>
          <td class="py-2.5 px-3 text-right space-x-2 font-sans">
            ${inst.running ? `
              <button onclick="disconnectPPPoEInstance('${inst.name}')" class="text-xs text-rose-400 hover:text-rose-300">Disconnect</button>
            ` : `
              <button onclick="connectPPPoEInstance('${inst.name}')" class="text-xs bg-blue-600/30 hover:bg-blue-600/50 text-blue-300 px-2 py-0.5 rounded border border-blue-500/30">Connect</button>
            `}
            <button onclick="togglePPPoEState('${inst.name}', ${inst.disabled ? 'true' : 'false'})" class="text-xs text-slate-400 hover:text-white">
              ${inst.disabled ? 'Enable' : 'Disable'}
            </button>
            <button onclick="openEditPPPoEModal('${inst.name}')" class="text-xs text-slate-400 hover:text-white">Edit</button>
            <button onclick="deletePPPoEInstance('${inst.name}')" class="text-xs text-slate-500 hover:text-rose-400">Delete</button>
          </td>
        `;
        tbody.appendChild(tr);
      });
    }
  } catch (err) {
    console.error('Failed to load PPPoE:', err);
  }
}

function openAddPPPoEModal() {
  document.getElementById('pppoe-modal-title').innerText = 'Add PPPoE Client Interface';
  document.getElementById('pppoe-modal-edit-orig').value = '';
  document.getElementById('pppoe-modal-name').value = `pppoe-out${(state.pppoeList || []).length + 1}`;
  document.getElementById('pppoe-modal-name').readOnly = false;
  document.getElementById('pppoe-modal-user').value = '';
  document.getElementById('pppoe-modal-pass').value = '';
  document.getElementById('pppoe-modal-service').value = '';
  document.getElementById('pppoe-modal-mtu').value = '1492';
  document.getElementById('pppoe-modal-defroute').checked = true;
  document.getElementById('pppoe-modal-reconnect').checked = true;
  document.getElementById('pppoe-modal-disabled').checked = false;

  // Populate profiles
  populateProfileSelect('pppoe-modal-profile', 'default', 'default');

  // Populate interfaces
  const sel = document.getElementById('pppoe-modal-iface');
  sel.innerHTML = '';
  (state.interfaces || []).forEach(i => {
    if (i.name === 'lo') return;
    const opt = document.createElement('option');
    opt.value = i.name;
    opt.innerText = `${i.name} (${i.role || i.type})`;
    sel.appendChild(opt);
  });

  document.getElementById('pppoe-modal').classList.remove('hidden');
}

function openEditPPPoEModal(name) {
  const inst = (state.pppoeList || []).find(i => i.name === name);
  if (!inst) return;

  document.getElementById('pppoe-modal-title').innerText = `Edit PPPoE Client: ${name}`;
  document.getElementById('pppoe-modal-edit-orig').value = name;
  document.getElementById('pppoe-modal-name').value = inst.name;
  document.getElementById('pppoe-modal-name').readOnly = true;
  document.getElementById('pppoe-modal-user').value = inst.username || '';
  document.getElementById('pppoe-modal-pass').value = inst.password || '';
  document.getElementById('pppoe-modal-service').value = inst.service_name || '';
  document.getElementById('pppoe-modal-mtu').value = inst.mtu || 1492;
  document.getElementById('pppoe-modal-defroute').checked = inst.default_route ?? true;
  document.getElementById('pppoe-modal-reconnect').checked = inst.auto_reconnect ?? true;
  document.getElementById('pppoe-modal-disabled').checked = !!inst.disabled;

  // Populate profiles
  populateProfileSelect('pppoe-modal-profile', inst.profile || 'default', 'default');

  const sel = document.getElementById('pppoe-modal-iface');
  sel.innerHTML = '';
  (state.interfaces || []).forEach(i => {
    if (i.name === 'lo') return;
    const opt = document.createElement('option');
    opt.value = i.name;
    opt.innerText = `${i.name} (${i.role || i.type})`;
    if (i.name === inst.interface) opt.selected = true;
    sel.appendChild(opt);
  });

  document.getElementById('pppoe-modal').classList.remove('hidden');
}

function closePPPoEModal() {
  document.getElementById('pppoe-modal').classList.add('hidden');
}

async function submitSavePPPoE(e) {
  e.preventDefault();
  const name = document.getElementById('pppoe-modal-name').value.trim();
  const iface = document.getElementById('pppoe-modal-iface').value;
  const user = document.getElementById('pppoe-modal-user').value.trim();
  const pass = document.getElementById('pppoe-modal-pass').value;
  const profile = document.getElementById('pppoe-modal-profile')?.value || 'default';
  const service = document.getElementById('pppoe-modal-service').value.trim();
  const mtu = parseInt(document.getElementById('pppoe-modal-mtu').value, 10) || 1492;
  const defRoute = document.getElementById('pppoe-modal-defroute').checked;
  const reconnect = document.getElementById('pppoe-modal-reconnect').checked;
  const disabled = document.getElementById('pppoe-modal-disabled').checked;

  try {
    const res = await fetch(`${API_BASE}/vpn/pppoe/clients`, {
      method: 'POST',
      headers: { 'Content-Type': 'application/json' },
      body: JSON.stringify({
        name,
        interface: iface,
        username: user,
        password: pass,
        profile: profile,
        service_name: service,
        mtu,
        default_route: defRoute,
        auto_reconnect: reconnect,
        disabled
      })
    });
    if (res.ok) {
      showToast('PPPoE Saved', `Configuration for ${name} saved`, 'success');
      closePPPoEModal();
      loadPPPoE(false);
      fetchData(false);
    } else {
      const err = await res.json();
      showToast('Error', err.message || 'Failed to save PPPoE', 'error');
    }
  } catch (err) {
    showToast('Error', err.message, 'error');
  }
}

async function connectPPPoEInstance(name) {
  try {
    const res = await fetch(`${API_BASE}/vpn/pppoe/clients/${encodeURIComponent(name)}/connect`, { method: 'POST' });
    if (res.ok) {
      showToast('Connecting', `Dialing ${name}...`, 'info');
      setTimeout(() => loadPPPoE(false), 2000);
    }
  } catch (err) {
    showToast('Error', err.message, 'error');
  }
}

async function disconnectPPPoEInstance(name) {
  try {
    const res = await fetch(`${API_BASE}/vpn/pppoe/clients/${encodeURIComponent(name)}/disconnect`, { method: 'POST' });
    if (res.ok) {
      showToast('Disconnected', `${name} session terminated`, 'info');
      setTimeout(() => loadPPPoE(false), 1000);
    }
  } catch (err) {
    showToast('Error', err.message, 'error');
  }
}

async function togglePPPoEState(name, enable) {
  try {
    const res = await fetch(`${API_BASE}/vpn/pppoe/clients/${encodeURIComponent(name)}/state`, {
      method: 'POST',
      headers: { 'Content-Type': 'application/json' },
      body: JSON.stringify({ enabled: enable })
    });
    if (res.ok) {
      showToast(enable ? 'Enabled' : 'Disabled', `${name} is now ${enable ? 'enabled' : 'disabled'}`, 'info');
      loadPPPoE(false);
    }
  } catch (err) {
    showToast('Error', err.message, 'error');
  }
}

async function deletePPPoEInstance(name) {
  if (!confirm(`Are you sure you want to delete PPPoE client ${name}?`)) return;
  try {
    const res = await fetch(`${API_BASE}/vpn/pppoe/clients/${encodeURIComponent(name)}`, { method: 'DELETE' });
    if (res.ok) {
      showToast('Deleted', `PPPoE client ${name} removed`, 'success');
      loadPPPoE(false);
      fetchData(false);
    }
  } catch (err) {
    showToast('Error', err.message, 'error');
  }
}

// ======================== WireGuard Multi-Interface & Multi-Peer ========================
state.wgSubTab = 'ifaces';

function switchWGSubTab(tab) {
  state.wgSubTab = tab;
  const ifacesPanel = document.getElementById('wg-subtab-ifaces');
  const peersPanel = document.getElementById('wg-subtab-peers');
  const ifacesBtn = document.getElementById('wg-subtab-btn-ifaces');
  const peersBtn = document.getElementById('wg-subtab-btn-peers');

  if (tab === 'ifaces') {
    ifacesPanel?.classList.remove('hidden');
    peersPanel?.classList.add('hidden');
    ifacesBtn.className = 'px-4 py-2.5 text-xs font-bold border-b-2 border-rose-500 text-white transition flex items-center gap-2';
    peersBtn.className = 'px-4 py-2.5 text-xs font-bold border-b-2 border-transparent text-slate-400 hover:text-slate-200 transition flex items-center gap-2';
  } else {
    ifacesPanel?.classList.add('hidden');
    peersPanel?.classList.remove('hidden');
    ifacesBtn.className = 'px-4 py-2.5 text-xs font-bold border-b-2 border-transparent text-slate-400 hover:text-slate-200 transition flex items-center gap-2';
    peersBtn.className = 'px-4 py-2.5 text-xs font-bold border-b-2 border-rose-500 text-white transition flex items-center gap-2';
    renderWGPeers();
  }
}

async function loadWireGuard(populateInputs = true) {
  try {
    const [ifacesRes, peersRes] = await Promise.all([
      fetch(`${API_BASE}/vpn/wireguard/interfaces`),
      fetch(`${API_BASE}/vpn/wireguard/peers`)
    ]);

    const ifaces = ifacesRes.ok ? await ifacesRes.json() : [];
    const peers = peersRes.ok ? await peersRes.json() : [];

    state.wgInterfaces = Array.isArray(ifaces) ? ifaces : [];
    state.wgPeers = Array.isArray(peers) ? peers : [];

    // Badges
    const ifacesCountBadge = document.getElementById('wg-ifaces-count');
    if (ifacesCountBadge) ifacesCountBadge.innerText = `${state.wgInterfaces.length} Interfaces`;
    const peersCountBadge = document.getElementById('wg-peers-count');
    if (peersCountBadge) peersCountBadge.innerText = `${state.wgPeers.length} Peers`;

    const subTabIfaces = document.getElementById('wg-subtab-badge-ifaces');
    if (subTabIfaces) subTabIfaces.innerText = state.wgInterfaces.length;
    const subTabPeers = document.getElementById('wg-subtab-badge-peers');
    if (subTabPeers) subTabPeers.innerText = state.wgPeers.length;

    // Render Interfaces
    const ifacesTbody = document.getElementById('wg-ifaces-table-body');
    const ifacesEmpty = document.getElementById('wg-ifaces-empty');
    if (ifacesTbody) {
      ifacesTbody.innerHTML = '';
      if (state.wgInterfaces.length === 0) {
        if (ifacesEmpty) ifacesEmpty.classList.remove('hidden');
      } else {
        if (ifacesEmpty) ifacesEmpty.classList.add('hidden');
        state.wgInterfaces.forEach(iface => {
          const peersOnIface = state.wgPeers.filter(p => p.interface === iface.name).length;
          const tr = document.createElement('tr');
          tr.className = 'hover:bg-slate-800/40 transition text-xs';
          tr.innerHTML = `
            <td class="py-2.5 px-3 text-center">${renderMikroTikFlag(iface.running, iface.disabled)}</td>
            <td class="py-2.5 px-3">
              <div class="flex items-center gap-1.5">
                <span class="font-bold text-white">${escapeHtml(iface.name)}</span>
                ${iface.comment ? `<span class="text-[10px] text-slate-400 font-sans italic">(${escapeHtml(iface.comment)})</span>` : ''}
              </div>
            </td>
            <td class="py-2.5 px-3 text-amber-400 font-mono">${iface.listen_port}</td>
            <td class="py-2.5 px-3 text-emerald-400 font-mono">${iface.address || '<span class="text-slate-600 font-sans">--</span>'}</td>
            <td class="py-2.5 px-3 text-slate-300 font-mono">
              <span class="cursor-pointer hover:text-white" onclick="copyToClipboard('${iface.public_key}', 'Public Key')" title="Click to copy: ${iface.public_key}">
                ${(iface.public_key || '').substring(0, 10)}... 📋
              </span>
            </td>
            <td class="py-2.5 px-3 text-slate-400 font-mono">${iface.mtu || 1420}</td>
            <td class="py-2.5 px-3 text-center">
              <span class="px-2 py-0.5 rounded text-[10px] font-sans bg-slate-800 text-slate-300">${peersOnIface} peer${peersOnIface !== 1 ? 's' : ''}</span>
            </td>
            <td class="py-2.5 px-3 text-right space-x-2 font-sans whitespace-nowrap">
              ${iface.running ? `
                <button onclick="stopWGInterface('${iface.name}')" class="text-xs text-rose-400 hover:text-rose-300 font-medium">Stop</button>
              ` : `
                <button onclick="startWGInterface('${iface.name}')" class="text-xs bg-rose-600/30 hover:bg-rose-600/50 text-rose-300 px-2 py-0.5 rounded border border-rose-500/30 font-medium">Start</button>
              `}
              <button onclick="toggleWGInterfaceState('${iface.name}', ${iface.disabled ? 'true' : 'false'})" class="text-xs text-slate-400 hover:text-white font-medium">
                ${iface.disabled ? 'Enable' : 'Disable'}
              </button>
              <button onclick="openEditWGInterfaceModal('${iface.name}')" class="text-xs text-amber-400 hover:text-amber-300 font-medium">Edit</button>
              <button onclick="deleteWGInterface('${iface.name}')" class="text-xs text-slate-500 hover:text-rose-400 font-medium">Delete</button>
            </td>
          `;
          ifacesTbody.appendChild(tr);
        });
      }
    }

    // Populate filter dropdown in peers tab
    const filterSel = document.getElementById('wg-peers-filter-iface');
    if (filterSel) {
      const currentVal = filterSel.value;
      filterSel.innerHTML = '<option value="">All Interfaces</option>';
      state.wgInterfaces.forEach(i => {
        const opt = document.createElement('option');
        opt.value = i.name;
        opt.innerText = i.name;
        if (i.name === currentVal) opt.selected = true;
        filterSel.appendChild(opt);
      });
    }

    renderWGPeers();
  } catch (err) {
    console.error('Failed to load WireGuard:', err);
  }
}

function formatWGPeerEndpoint(address, port) {
  if (!address || address === '(none)') return '--';
  let addr = address.trim();
  let p = port || 0;
  while (addr.includes(':') && !addr.startsWith('[')) {
    const lastColon = addr.lastIndexOf(':');
    const maybePort = addr.substring(lastColon + 1);
    if (!isNaN(parseInt(maybePort, 10)) && parseInt(maybePort, 10) > 0) {
      if (!p) p = parseInt(maybePort, 10);
      addr = addr.substring(0, lastColon);
    } else {
      break;
    }
  }
  return p ? `${addr}:${p}` : addr;
}

function renderWGPeers() {
  const filterSel = document.getElementById('wg-peers-filter-iface');
  const selectedIface = filterSel ? filterSel.value : '';

  const tbody = document.getElementById('wg-peers-table-body');
  const empty = document.getElementById('wg-peers-empty');
  if (!tbody) return;
  tbody.innerHTML = '';

  const filtered = selectedIface ? state.wgPeers.filter(p => p.interface === selectedIface) : state.wgPeers;

  if (filtered.length === 0) {
    if (empty) empty.classList.remove('hidden');
  } else {
    if (empty) empty.classList.add('hidden');
    filtered.forEach(p => {
      const isOnline = p.latest_handshake && !p.latest_handshake.includes('Never');
      const tr = document.createElement('tr');
      tr.className = 'hover:bg-slate-800/40 transition text-xs';
      tr.innerHTML = `
        <td class="py-2.5 px-3 text-center">${renderMikroTikFlag(isOnline, p.disabled)}</td>
        <td class="py-2.5 px-3 font-mono font-bold text-rose-400">${escapeHtml(p.interface)}</td>
        <td class="py-2.5 px-3 font-bold text-white font-sans">${escapeHtml(p.name || 'Unnamed')}</td>
        <td class="py-2.5 px-3 text-slate-300 font-mono">
          <span class="cursor-pointer hover:text-white" onclick="copyToClipboard('${p.public_key}', 'Peer Public Key')" title="${p.public_key}">
            ${(p.public_key || '').substring(0, 10)}... 📋
          </span>
        </td>
        <td class="py-2.5 px-3 text-emerald-400 font-mono font-semibold">${(p.allowed_ips || []).join(', ')}</td>
        <td class="py-2.5 px-3 text-slate-400 font-mono">${formatWGPeerEndpoint(p.endpoint_address, p.endpoint_port)}</td>
        <td class="py-2.5 px-3 text-slate-300 font-sans">${p.latest_handshake || 'Never'}</td>
        <td class="py-2.5 px-3 font-mono text-[11px]">
          <span class="text-emerald-400">↓ ${p.transfer_rx_human || '0 B'}</span>
          <span class="text-cyan-400 ml-1">↑ ${p.transfer_tx_human || '0 B'}</span>
        </td>
        <td class="py-2.5 px-3 text-right font-sans space-x-2 whitespace-nowrap">
          <button onclick="toggleWGPeerState('${escapeHtml(p.interface)}', '${escapeHtml(p.public_key)}', ${p.disabled ? 'true' : 'false'})" class="text-xs ${p.disabled ? 'text-emerald-400 hover:text-emerald-300' : 'text-slate-400 hover:text-white'} font-medium">
            ${p.disabled ? 'Enable' : 'Disable'}
          </button>
          <button onclick="openEditWGPeerModal('${escapeHtml(p.interface)}', '${escapeHtml(p.public_key)}')" class="text-xs text-amber-400 hover:text-amber-300 font-medium">Edit</button>
          <button onclick="openWGClientConfModal('${escapeHtml(p.interface)}', '${(p.allowed_ips || [])[0] || '10.10.0.2/32'}')" class="text-xs text-cyan-400 hover:text-cyan-300 font-semibold" title="Generate WireGuard Client Profile (.conf)">Config (.conf)</button>
          <button onclick="deleteWGPeer('${escapeHtml(p.interface)}', '${escapeHtml(p.public_key)}')" class="text-xs text-rose-400 hover:text-rose-300 font-medium">Delete</button>
        </td>
      `;
      tbody.appendChild(tr);
    });
  }
}

function openAddWGInterfaceModal() {
  document.getElementById('wg-iface-modal-title').innerText = 'Add WireGuard Interface';
  document.getElementById('wg-iface-modal-edit-orig').value = '';
  const nameEl = document.getElementById('wg-iface-modal-name');
  nameEl.value = `wg${(state.wgInterfaces || []).length}`;
  nameEl.readOnly = false;
  document.getElementById('wg-iface-modal-port').value = 51820 + (state.wgInterfaces || []).length;
  document.getElementById('wg-iface-modal-addr').value = `10.${10 + (state.wgInterfaces || []).length}.0.1/24`;
  document.getElementById('wg-iface-modal-mtu').value = '1420';
  document.getElementById('wg-iface-modal-comment').value = '';
  document.getElementById('wg-iface-modal-pubkey').value = '';
  document.getElementById('wg-iface-modal-privkey').value = '';
  document.getElementById('wg-iface-modal-disabled').checked = false;

  generateWGInterfaceKeys();
  document.getElementById('wg-iface-modal').classList.remove('hidden');
}

function openEditWGInterfaceModal(name) {
  const iface = (state.wgInterfaces || []).find(i => i.name === name);
  if (!iface) return;

  document.getElementById('wg-iface-modal-title').innerText = `Edit WireGuard Interface: ${name}`;
  document.getElementById('wg-iface-modal-edit-orig').value = name;
  const nameEl = document.getElementById('wg-iface-modal-name');
  nameEl.value = iface.name;
  nameEl.readOnly = false; // ALLOW RENAMING
  document.getElementById('wg-iface-modal-port').value = iface.listen_port || 51820;
  document.getElementById('wg-iface-modal-addr').value = iface.address || '';
  document.getElementById('wg-iface-modal-mtu').value = iface.mtu || 1420;
  document.getElementById('wg-iface-modal-comment').value = iface.comment || '';
  document.getElementById('wg-iface-modal-pubkey').value = iface.public_key || '';
  document.getElementById('wg-iface-modal-privkey').value = iface.private_key || '';
  document.getElementById('wg-iface-modal-disabled').checked = !!iface.disabled;

  document.getElementById('wg-iface-modal').classList.remove('hidden');
}

function closeAddWGInterfaceModal() {
  document.getElementById('wg-iface-modal').classList.add('hidden');
}

async function generateWGInterfaceKeys() {
  try {
    const res = await fetch(`${API_BASE}/vpn/wireguard/genkeys`, { method: 'POST' });
    const keys = await res.json();
    if (res.ok) {
      document.getElementById('wg-iface-modal-privkey').value = keys.private_key;
      document.getElementById('wg-iface-modal-pubkey').value = keys.public_key;
    }
  } catch (err) {
    showToast('Error', 'Failed to generate keypair: ' + err.message, 'error');
  }
}

async function onWGInterfacePrivKeyInput() {
  const privKey = document.getElementById('wg-iface-modal-privkey').value.trim();
  if (!privKey) return;
  try {
    const res = await fetch(`${API_BASE}/vpn/wireguard/calc-pubkey`, {
      method: 'POST',
      headers: { 'Content-Type': 'application/json' },
      body: JSON.stringify({ private_key: privKey })
    });
    if (res.ok) {
      const data = await res.json();
      if (data.public_key) {
        document.getElementById('wg-iface-modal-pubkey').value = data.public_key;
      }
    }
  } catch (err) {
    // Ignore while typing
  }
}

function toggleWGPrivKeyVisibility() {
  const el = document.getElementById('wg-iface-modal-privkey');
  const btn = document.getElementById('btn-toggle-wg-privkey');
  if (el.type === 'password') {
    el.type = 'text';
    btn.innerText = '🙈 Hide';
  } else {
    el.type = 'password';
    btn.innerText = '👁️ Show';
  }
}

function copyWGInterfacePubKey() {
  const pub = document.getElementById('wg-iface-modal-pubkey').value;
  if (pub) copyToClipboard(pub, 'Interface Public Key');
}

async function submitSaveWGInterface(e) {
  e.preventDefault();
  const origName = document.getElementById('wg-iface-modal-edit-orig').value.trim();
  const name = document.getElementById('wg-iface-modal-name').value.trim();
  const port = parseInt(document.getElementById('wg-iface-modal-port').value, 10) || 51820;
  const addr = document.getElementById('wg-iface-modal-addr').value.trim();
  const mtu = parseInt(document.getElementById('wg-iface-modal-mtu').value, 10) || 1420;
  const comment = document.getElementById('wg-iface-modal-comment').value.trim();
  const pub = document.getElementById('wg-iface-modal-pubkey').value.trim();
  const priv = document.getElementById('wg-iface-modal-privkey').value.trim();
  const disabled = document.getElementById('wg-iface-modal-disabled').checked;

  try {
    const res = await fetch(`${API_BASE}/vpn/wireguard/interfaces`, {
      method: 'POST',
      headers: { 'Content-Type': 'application/json' },
      body: JSON.stringify({
        orig_name: origName,
        name,
        listen_port: port,
        address: addr,
        mtu,
        comment,
        public_key: pub,
        private_key: priv,
        disabled
      })
    });
    const data = await res.json();
    if (res.ok) {
      showToast('WireGuard Saved', `Interface ${name} configured successfully`, 'success');
      closeAddWGInterfaceModal();
      loadWireGuard(false);
      fetchData(false);
    } else {
      showToast('Error', data.error || 'Failed to save interface', 'error');
    }
  } catch (err) {
    showToast('Error', err.message, 'error');
  }
}

async function startWGInterface(name) {
  try {
    const res = await fetch(`${API_BASE}/vpn/wireguard/interfaces/${encodeURIComponent(name)}/start`, { method: 'POST' });
    if (res.ok) {
      showToast('Interface UP', `Started WireGuard interface ${name}`, 'success');
      loadWireGuard(false);
      fetchData(false);
    }
  } catch (err) {
    showToast('Error', err.message, 'error');
  }
}

async function stopWGInterface(name) {
  try {
    const res = await fetch(`${API_BASE}/vpn/wireguard/interfaces/${encodeURIComponent(name)}/stop`, { method: 'POST' });
    if (res.ok) {
      showToast('Interface DOWN', `Stopped WireGuard interface ${name}`, 'info');
      loadWireGuard(false);
      fetchData(false);
    }
  } catch (err) {
    showToast('Error', err.message, 'error');
  }
}

async function toggleWGInterfaceState(name, enable) {
  try {
    const res = await fetch(`${API_BASE}/vpn/wireguard/interfaces/${encodeURIComponent(name)}/state`, {
      method: 'POST',
      headers: { 'Content-Type': 'application/json' },
      body: JSON.stringify({ enabled: enable })
    });
    if (res.ok) {
      showToast(enable ? 'Enabled' : 'Disabled', `${name} state updated`, 'info');
      loadWireGuard(false);
      fetchData(false);
    }
  } catch (err) {
    showToast('Error', err.message, 'error');
  }
}

async function deleteWGInterface(name) {
  if (!confirm(`Are you sure you want to delete WireGuard interface ${name}? All associated peers will also be removed.`)) return;
  try {
    const res = await fetch(`${API_BASE}/vpn/wireguard/interfaces/${encodeURIComponent(name)}`, { method: 'DELETE' });
    if (res.ok) {
      showToast('Deleted', `Interface ${name} removed`, 'success');
      loadWireGuard(false);
      fetchData(false);
    }
  } catch (err) {
    showToast('Error', err.message, 'error');
  }
}

function populateWGPeerIfaceSelect(selectedIface = '') {
  const sel = document.getElementById('wg-peer-modal-iface');
  if (!sel) return;
  sel.innerHTML = '';
  (state.wgInterfaces || []).forEach(i => {
    const opt = document.createElement('option');
    opt.value = i.name;
    opt.innerText = `${i.name} (${i.address || 'No IP'})`;
    if (i.name === selectedIface) opt.selected = true;
    sel.appendChild(opt);
  });
}

function openAddWGPeerModal() {
  if ((state.wgInterfaces || []).length === 0) {
    showToast('No Interfaces', 'Please add a WireGuard interface first before adding peers', 'warning');
    openAddWGInterfaceModal();
    return;
  }

  document.getElementById('wg-peer-modal-title').innerText = 'Add WireGuard Peer';
  document.getElementById('wg-peer-modal-edit-orig-iface').value = '';
  document.getElementById('wg-peer-modal-edit-orig-pubkey').value = '';

  populateWGPeerIfaceSelect();

  document.getElementById('wg-peer-modal-name').value = '';
  document.getElementById('wg-peer-modal-pubkey').value = '';
  document.getElementById('wg-peer-modal-allowedips').value = '10.10.0.2/32';
  document.getElementById('wg-peer-modal-endpoint').value = '';
  document.getElementById('wg-peer-modal-port').value = '';
  document.getElementById('wg-peer-modal-keepalive').value = '25';
  document.getElementById('wg-peer-modal-preshared').value = '';
  document.getElementById('wg-peer-modal-disabled').checked = false;

  document.getElementById('wg-peer-key-warning').classList.add('hidden');
  document.getElementById('wg-peer-gen-key-box').classList.add('hidden');

  document.getElementById('wg-peer-modal').classList.remove('hidden');
}

function openEditWGPeerModal(ifaceName, pubKey) {
  const peer = (state.wgPeers || []).find(p => p.interface === ifaceName && p.public_key === pubKey);
  if (!peer) {
    showToast('Not Found', 'Peer not found', 'warning');
    return;
  }

  document.getElementById('wg-peer-modal-title').innerText = `Edit WireGuard Peer (${peer.name || ifaceName})`;
  document.getElementById('wg-peer-modal-edit-orig-iface').value = peer.interface;
  document.getElementById('wg-peer-modal-edit-orig-pubkey').value = peer.public_key;

  populateWGPeerIfaceSelect(peer.interface);

  document.getElementById('wg-peer-modal-name').value = peer.name || '';
  document.getElementById('wg-peer-modal-pubkey').value = peer.public_key || '';
  document.getElementById('wg-peer-modal-allowedips').value = (peer.allowed_ips || []).join(', ');
  let epHost = (peer.endpoint_address || '').trim();
  let epPort = peer.endpoint_port || '';
  while (epHost.includes(':') && !epHost.startsWith('[')) {
    const lastColon = epHost.lastIndexOf(':');
    const maybePort = epHost.substring(lastColon + 1);
    if (!isNaN(parseInt(maybePort, 10)) && parseInt(maybePort, 10) > 0) {
      if (!epPort) epPort = parseInt(maybePort, 10);
      epHost = epHost.substring(0, lastColon);
    } else {
      break;
    }
  }

  document.getElementById('wg-peer-modal-endpoint').value = epHost;
  document.getElementById('wg-peer-modal-port').value = epPort;
  document.getElementById('wg-peer-modal-keepalive').value = peer.persistent_keepalive ?? 25;
  document.getElementById('wg-peer-modal-preshared').value = peer.preshared_key || '';
  document.getElementById('wg-peer-modal-disabled').checked = !!peer.disabled;

  document.getElementById('wg-peer-key-warning').classList.add('hidden');
  document.getElementById('wg-peer-gen-key-box').classList.add('hidden');

  document.getElementById('wg-peer-modal').classList.remove('hidden');
}

function closeAddWGPeerModal() {
  document.getElementById('wg-peer-modal').classList.add('hidden');
}

async function generatePeerKeypairHelper() {
  try {
    const res = await fetch(`${API_BASE}/vpn/wireguard/genkeys`, { method: 'POST' });
    const keys = await res.json();
    if (res.ok) {
      document.getElementById('wg-peer-modal-pubkey').value = keys.public_key;
      document.getElementById('wg-peer-gen-privkey').value = keys.private_key;
      document.getElementById('wg-peer-gen-key-box').classList.remove('hidden');
      checkWGPeerKeyValidity();
      showToast('Keypair Generated', 'Public key inserted and client private key ready to copy', 'info');
    }
  } catch (err) {
    showToast('Error', 'Failed to generate keypair: ' + err.message, 'error');
  }
}

function copyGeneratedPeerPrivKey() {
  const priv = document.getElementById('wg-peer-gen-privkey').value;
  if (priv) copyToClipboard(priv, 'Client Private Key');
}

async function generatePeerPSK() {
  try {
    const res = await fetch(`${API_BASE}/vpn/wireguard/genkeys`, { method: 'POST' });
    const keys = await res.json();
    if (res.ok && keys.private_key) {
      document.getElementById('wg-peer-modal-preshared').value = keys.private_key;
      showToast('PSK Generated', 'Generated 256-bit preshared key', 'info');
    }
  } catch (err) {
    showToast('Error', err.message, 'error');
  }
}

function checkWGPeerKeyValidity() {
  const ifaceName = document.getElementById('wg-peer-modal-iface').value;
  const peerPubKey = document.getElementById('wg-peer-modal-pubkey').value.trim();
  const warningEl = document.getElementById('wg-peer-key-warning');
  if (!warningEl) return;

  const targetIface = (state.wgInterfaces || []).find(i => i.name === ifaceName);
  if (targetIface && targetIface.public_key && peerPubKey && targetIface.public_key === peerPubKey) {
    warningEl.classList.remove('hidden');
  } else {
    warningEl.classList.add('hidden');
  }
}

async function submitSaveWGPeer(e) {
  e.preventDefault();
  const origIface = document.getElementById('wg-peer-modal-edit-orig-iface').value.trim();
  const origPubKey = document.getElementById('wg-peer-modal-edit-orig-pubkey').value.trim();

  const iface = document.getElementById('wg-peer-modal-iface').value;
  const name = document.getElementById('wg-peer-modal-name').value.trim();
  const pub = document.getElementById('wg-peer-modal-pubkey').value.trim();
  const allowed = document.getElementById('wg-peer-modal-allowedips').value
    .split(',')
    .map(s => s.trim())
    .filter(s => s.length > 0);
  let epHost = document.getElementById('wg-peer-modal-endpoint').value.trim();
  let epPort = parseInt(document.getElementById('wg-peer-modal-port').value, 10) || 0;
  while (epHost.includes(':') && !epHost.startsWith('[')) {
    const lastColon = epHost.lastIndexOf(':');
    const maybePort = epHost.substring(lastColon + 1);
    if (!isNaN(parseInt(maybePort, 10)) && parseInt(maybePort, 10) > 0) {
      if (!epPort) epPort = parseInt(maybePort, 10);
      epHost = epHost.substring(0, lastColon);
    } else {
      break;
    }
  }
  const keepalive = parseInt(document.getElementById('wg-peer-modal-keepalive').value, 10) || 0;
  const psk = document.getElementById('wg-peer-modal-preshared').value.trim();
  const disabled = document.getElementById('wg-peer-modal-disabled').checked;

  // Validation
  const targetIface = (state.wgInterfaces || []).find(i => i.name === iface);
  if (targetIface && targetIface.public_key === pub) {
    showToast('Invalid Peer Key', 'Peer public key cannot be the same as the interface public key!', 'error');
    return;
  }

  try {
    const res = await fetch(`${API_BASE}/vpn/wireguard/peers`, {
      method: 'POST',
      headers: { 'Content-Type': 'application/json' },
      body: JSON.stringify({
        orig_interface: origIface,
        orig_public_key: origPubKey,
        interface: iface,
        name,
        public_key: pub,
        allowed_ips: allowed,
        endpoint_address: epHost,
        endpoint_port: epPort,
        persistent_keepalive: keepalive,
        preshared_key: psk,
        disabled
      })
    });
    const data = await res.json();
    if (res.ok) {
      showToast('Peer Saved', `Peer ${name} saved on ${iface}`, 'success');
      closeAddWGPeerModal();
      loadWireGuard(false);
    } else {
      showToast('Error', data.error || 'Failed to save peer', 'error');
    }
  } catch (err) {
    showToast('Error', err.message, 'error');
  }
}

async function toggleWGPeerState(iface, pubkey, enable) {
  try {
    const res = await fetch(`${API_BASE}/vpn/wireguard/peers/state`, {
      method: 'POST',
      headers: { 'Content-Type': 'application/json' },
      body: JSON.stringify({ interface: iface, public_key: pubkey, enabled: enable })
    });
    const data = await res.json();
    if (res.ok) {
      showToast(enable ? 'Peer Enabled' : 'Peer Disabled', `Peer state updated on ${iface}`, 'info');
      loadWireGuard(false);
    } else {
      showToast('Error', data.error || 'Failed to update peer state', 'error');
    }
  } catch (err) {
    showToast('Error', err.message, 'error');
  }
}

async function deleteWGPeer(iface, pubkey) {
  if (!confirm(`Are you sure you want to remove peer from ${iface}?`)) return;
  try {
    const res = await fetch(`${API_BASE}/vpn/wireguard/peers/delete`, {
      method: 'POST',
      headers: { 'Content-Type': 'application/json' },
      body: JSON.stringify({ interface: iface, public_key: pubkey })
    });
    const data = await res.json();
    if (res.ok) {
      showToast('Peer Deleted', 'WireGuard peer removed', 'success');
      loadWireGuard(false);
    } else {
      showToast('Error', data.error || 'Failed to remove peer', 'error');
    }
  } catch (err) {
    showToast('Error', err.message, 'error');
  }
}

// ======================== IPSec FortiGate Phase 1 & 2 Multi-Tunnel Engine ========================
function switchIpsecModalTab(tab) {
  const p1Tab = document.getElementById('tab-btn-ipsec-p1');
  const p2Tab = document.getElementById('tab-btn-ipsec-p2');
  const p1Content = document.getElementById('ipsec-tab-content-p1');
  const p2Content = document.getElementById('ipsec-tab-content-p2');
  const stepBtn = document.getElementById('btn-ipsec-switch-step');

  if (tab === 'p1') {
    if (p1Tab) {
      p1Tab.className = 'px-4 py-2 text-xs font-bold border-b-2 border-amber-500 text-amber-300 transition flex items-center gap-2';
    }
    if (p2Tab) {
      p2Tab.className = 'px-4 py-2 text-xs font-bold border-b-2 border-transparent text-slate-400 hover:text-slate-200 transition flex items-center gap-2';
    }
    if (p1Content) p1Content.classList.remove('hidden');
    if (p2Content) p2Content.classList.add('hidden');
    if (stepBtn) stepBtn.innerHTML = 'Next: Phase 2 Selectors &rarr;';
  } else {
    if (p1Tab) {
      p1Tab.className = 'px-4 py-2 text-xs font-bold border-b-2 border-transparent text-slate-400 hover:text-slate-200 transition flex items-center gap-2';
    }
    if (p2Tab) {
      p2Tab.className = 'px-4 py-2 text-xs font-bold border-b-2 border-cyan-500 text-cyan-300 transition flex items-center gap-2';
    }
    if (p1Content) p1Content.classList.add('hidden');
    if (p2Content) p2Content.classList.remove('hidden');
    if (stepBtn) stepBtn.innerHTML = '&larr; Back: Phase 1 (IKE)';
  }
}

function toggleIpsecPhaseStep() {
  const p1Content = document.getElementById('ipsec-tab-content-p1');
  if (p1Content && !p1Content.classList.contains('hidden')) {
    switchIpsecModalTab('p2');
  } else {
    switchIpsecModalTab('p1');
  }
}

function toggleIpsecPskVisibility() {
  const pskInput = document.getElementById('ipsec-modal-psk');
  if (!pskInput) return;
  pskInput.type = pskInput.type === 'password' ? 'text' : 'password';
}

function addIpsecLocalSubnet(val = '') {
  const container = document.getElementById('ipsec-modal-local-subnets-container');
  if (!container) return;
  const row = document.createElement('div');
  row.className = 'flex items-center gap-2 ipsec-subnet-row';
  row.innerHTML = `
    <input type="text" value="${escapeHtml(val)}" placeholder="e.g. 192.168.10.0/24 or 10.0.1.0/24" class="flex-1 bg-slate-900 border border-slate-700 rounded-lg px-3 py-1.5 text-white font-mono text-xs focus:outline-none focus:border-cyan-500">
    <button type="button" onclick="this.closest('.ipsec-subnet-row').remove()" class="w-7 h-7 flex items-center justify-center bg-slate-800 hover:bg-rose-950 text-slate-400 hover:text-rose-400 border border-slate-700 rounded-lg text-base font-bold transition" title="Remove local subnet">-</button>
  `;
  container.appendChild(row);
}

function addIpsecRemoteSubnet(val = '') {
  const container = document.getElementById('ipsec-modal-remote-subnets-container');
  if (!container) return;
  const row = document.createElement('div');
  row.className = 'flex items-center gap-2 ipsec-subnet-row';
  row.innerHTML = `
    <input type="text" value="${escapeHtml(val)}" placeholder="e.g. 192.168.20.0/24 or 10.0.2.0/24" class="flex-1 bg-slate-900 border border-slate-700 rounded-lg px-3 py-1.5 text-white font-mono text-xs focus:outline-none focus:border-purple-500">
    <button type="button" onclick="this.closest('.ipsec-subnet-row').remove()" class="w-7 h-7 flex items-center justify-center bg-slate-800 hover:bg-rose-950 text-slate-400 hover:text-rose-400 border border-slate-700 rounded-lg text-base font-bold transition" title="Remove remote subnet">-</button>
  `;
  container.appendChild(row);
}

function updateIpsecEspProposalFromPFS(val) {
  const prop = document.getElementById('ipsec-modal-espprop');
  if (!prop) return;
  if (val === 'none') {
    prop.value = 'aes256-sha256,aes128-sha256,default';
  } else {
    prop.value = `aes256-sha256-${val},aes128-sha256-${val},default`;
  }
}

function updateIpsecIkeProposalFromDH(dh) {
  const el = document.getElementById('ipsec-modal-ikeprop');
  if (el) {
    el.value = `aes256-sha256-${dh},aes128-sha256-${dh},default`;
  }
}

function safeSetVal(id, val) {
  const el = document.getElementById(id);
  if (el) el.value = val;
}

function safeSetChecked(id, val) {
  const el = document.getElementById(id);
  if (el) el.checked = !!val;
}

function safeGetVal(id, def = '') {
  const el = document.getElementById(id);
  return el ? el.value : def;
}

async function loadIPSec(populateInputs = true) {
  try {
    const res = await fetch(`${API_BASE}/vpn/ipsec/tunnels`);
    const list = await res.json();
    state.ipsecTunnels = Array.isArray(list) ? list : [];

    const activeCount = state.ipsecTunnels.filter(t => t.running || t.status === 'ESTABLISHED').length;
    const badge = document.getElementById('ipsec-sas-badge');
    if (badge) badge.innerText = `${activeCount} Active SAs`;

    const tbody = document.getElementById('ipsec-table-body');
    const empty = document.getElementById('ipsec-empty');
    if (!tbody) return;
    tbody.innerHTML = '';

    if (state.ipsecTunnels.length === 0) {
      if (empty) empty.classList.remove('hidden');
    } else {
      if (empty) empty.classList.add('hidden');
      state.ipsecTunnels.forEach(c => {
        const isEstablished = c.running || c.status === 'ESTABLISHED';
        const tr = document.createElement('tr');
        tr.className = 'hover:bg-slate-800/40 transition text-xs select-none';

        // Local subnets tags
        const localList = (c.local_subnets && c.local_subnets.length > 0) ? c.local_subnets : (c.local_subnet ? [c.local_subnet] : ['0.0.0.0/0']);
        const localBadges = localList.map(s => `<span class="px-1.5 py-0.5 rounded bg-cyan-950/60 border border-cyan-800/60 text-cyan-300 font-mono text-[10px] mr-1">${escapeHtml(s)}</span>`).join('');

        // Remote subnets tags
        const remoteList = (c.remote_subnets && c.remote_subnets.length > 0) ? c.remote_subnets : (c.remote_subnet ? [c.remote_subnet] : ['0.0.0.0/0']);
        const remoteBadges = remoteList.map(s => `<span class="px-1.5 py-0.5 rounded bg-purple-950/60 border border-purple-800/60 text-purple-300 font-mono text-[10px] mr-1">${escapeHtml(s)}</span>`).join('');

        const ikeVersionBadge = (c.ike_version || 'ikev2').toUpperCase();
        const p2Name = c.phase2_name || `${c.name}_p2`;

        tr.innerHTML = `
          <td class="py-2.5 px-3 text-center">
            ${isEstablished ? `
              <span class="inline-flex items-center gap-1.5 text-emerald-400 font-mono font-bold text-[11px]" title="Active SA Established">
                <span class="w-2.5 h-2.5 rounded-full bg-emerald-400 animate-pulse"></span>
                <span>UP</span>
              </span>
            ` : (c.disabled ? `
              <span class="inline-flex items-center gap-1.5 text-slate-500 font-mono text-[11px]" title="Tunnel Disabled">
                <span class="w-2 h-2 rounded-full bg-rose-500"></span>
                <span>DOWN</span>
              </span>
            ` : `
              <span class="inline-flex items-center gap-1.5 text-amber-400 font-mono text-[11px]" title="Disconnected / Idle">
                <span class="w-2 h-2 rounded-full bg-amber-400"></span>
                <span>IDLE</span>
              </span>
            `)}
          </td>
          <td class="py-2.5 px-4 font-bold text-white">
            <div class="flex items-center gap-2">
              <span class="text-amber-400">🛡</span>
              <div>
                <div>${escapeHtml(c.name)}</div>
                <div class="text-[10px] text-slate-500 font-normal">P2: ${escapeHtml(p2Name)}</div>
              </div>
            </div>
          </td>
          <td class="py-2.5 px-4 text-slate-300 font-mono font-medium">${escapeHtml(c.remote_addrs || '%any')}</td>
          <td class="py-2.5 px-4 font-sans">
            <div class="flex items-center gap-1.5">
              <span class="px-1.5 py-0.5 rounded bg-amber-500/10 text-amber-300 border border-amber-500/30 font-mono text-[10px] font-semibold">${ikeVersionBadge}</span>
              <span class="text-[10px] text-slate-400">${c.auth_method || 'PSK'}</span>
            </div>
          </td>
          <td class="py-2.5 px-4">
            <div class="space-y-1">
              <div class="flex items-center flex-wrap gap-1">
                <span class="text-[9px] text-cyan-400 uppercase font-bold mr-1">Local:</span>
                ${localBadges}
              </div>
              <div class="flex items-center flex-wrap gap-1">
                <span class="text-[9px] text-purple-400 uppercase font-bold mr-1">Remote:</span>
                ${remoteBadges}
              </div>
            </div>
          </td>
          <td class="py-2.5 px-4 font-mono text-[11px] text-slate-400">
            <div class="truncate max-w-[140px]" title="${escapeHtml(c.esp_proposals || '')}">
              ${escapeHtml(c.esp_proposals || 'aes256-sha256')}
            </div>
            <div class="text-[10px] text-slate-500">PFS: ${escapeHtml(c.pfs_group || 'modp2048')}</div>
          </td>
          <td class="py-2.5 px-4 text-right space-x-2 font-sans">
            ${isEstablished ? `
              <button onclick="stopIPSecTunnel('${c.name}')" class="px-2 py-0.5 text-xs bg-rose-500/20 text-rose-400 hover:bg-rose-500/30 rounded border border-rose-500/30 font-medium">Bring Down</button>
            ` : `
              <button onclick="startIPSecTunnel('${c.name}')" class="px-2 py-0.5 text-xs bg-emerald-500/20 text-emerald-400 hover:bg-emerald-500/30 rounded border border-emerald-500/30 font-semibold">Bring Up</button>
            `}
            <button onclick="toggleIPSecState('${c.name}', ${c.disabled ? 'true' : 'false'})" class="text-xs text-slate-400 hover:text-white">
              ${c.disabled ? 'Enable' : 'Disable'}
            </button>
            <button onclick="openEditIPSecModal('${c.name}')" class="text-xs text-amber-400 hover:text-amber-300">Edit</button>
            <button onclick="deleteIPSecConn('${c.name}')" class="text-xs text-slate-500 hover:text-rose-400">Delete</button>
          </td>
        `;
        tbody.appendChild(tr);
      });
    }
  } catch (err) {
    console.error('Failed to load IPSec:', err);
  }
}

function openAddIPSecModal() {
  const modal = document.getElementById('ipsec-modal');
  if (!modal) return;

  const title = document.getElementById('ipsec-modal-title');
  if (title) title.innerText = 'Configure IPSec Site-to-Site Tunnel';
  
  // Phase 1 Fields
  safeSetVal('ipsec-modal-name', `tunnel-${(state.ipsecTunnels || []).length + 1}`);
  const nameEl = document.getElementById('ipsec-modal-name');
  if (nameEl) nameEl.readOnly = false;
  safeSetVal('ipsec-modal-ikeversion', 'ikev2');
  safeSetVal('ipsec-modal-ikever', 'ikev2');
  safeSetVal('ipsec-modal-remotegw', '');
  safeSetVal('ipsec-modal-localaddrs', '');
  safeSetVal('ipsec-modal-comments', '');
  safeSetVal('ipsec-modal-psk', '');
  safeSetVal('ipsec-modal-ikeprop', 'aes256-sha256-modp2048,aes128-sha256-modp2048,default');
  safeSetVal('ipsec-modal-dhgroup', 'modp2048');
  safeSetVal('ipsec-modal-ikekeylife', '86400');
  safeSetVal('ipsec-modal-localid', '');
  safeSetVal('ipsec-modal-remoteid', '');
  safeSetVal('ipsec-modal-dpd', 'on-demand');

  // Phase 2 Fields
  safeSetVal('ipsec-modal-p2name', `tunnel-${(state.ipsecTunnels || []).length + 1}_p2`);
  safeSetVal('ipsec-modal-espkeylife', '28800');
  safeSetVal('ipsec-modal-espprop', 'aes256-sha256-modp2048,aes128-sha256-modp2048,default');
  safeSetVal('ipsec-modal-pfsgroup', 'modp2048');
  safeSetChecked('ipsec-modal-autostart', true);
  safeSetChecked('ipsec-modal-disabled', false);

  // Clear & Populate default dynamic subnets
  const localContainer = document.getElementById('ipsec-modal-local-subnets-container');
  const remoteContainer = document.getElementById('ipsec-modal-remote-subnets-container');
  if (localContainer) {
    localContainer.innerHTML = '';
    addIpsecLocalSubnet('192.168.10.0/24');
  }
  if (remoteContainer) {
    remoteContainer.innerHTML = '';
    addIpsecRemoteSubnet('192.168.20.0/24');
  }

  switchIpsecModalTab('p1');
  modal.classList.remove('hidden');
}

function openEditIPSecModal(name) {
  const modal = document.getElementById('ipsec-modal');
  if (!modal) return;

  const conn = (state.ipsecTunnels || []).find(c => c.name === name);
  if (!conn) return;

  const title = document.getElementById('ipsec-modal-title');
  if (title) title.innerText = `Edit IPSec Tunnel: ${name}`;
  
  // Phase 1 Fields
  safeSetVal('ipsec-modal-name', conn.name);
  const nameEl = document.getElementById('ipsec-modal-name');
  if (nameEl) nameEl.readOnly = true;
  safeSetVal('ipsec-modal-ikeversion', conn.ike_version || 'ikev2');
  safeSetVal('ipsec-modal-ikever', conn.ike_version || 'ikev2');
  safeSetVal('ipsec-modal-remotegw', conn.remote_addrs || '');
  safeSetVal('ipsec-modal-localaddrs', conn.local_addrs || '');
  safeSetVal('ipsec-modal-comments', conn.comment || '');
  safeSetVal('ipsec-modal-psk', conn.preshared_key || '');
  safeSetVal('ipsec-modal-ikeprop', conn.ike_proposals || 'aes256-sha256-modp2048,default');
  safeSetVal('ipsec-modal-ikekeylife', conn.ike_keylife || 86400);
  safeSetVal('ipsec-modal-localid', conn.local_id || '');
  safeSetVal('ipsec-modal-remoteid', conn.remote_id || '');
  safeSetVal('ipsec-modal-dpd', conn.dpd || 'on-demand');

  // Phase 2 Fields
  safeSetVal('ipsec-modal-p2name', conn.phase2_name || `${conn.name}_p2`);
  safeSetVal('ipsec-modal-espkeylife', conn.esp_keylife || 28800);
  safeSetVal('ipsec-modal-espprop', conn.esp_proposals || 'aes256-sha256-modp2048,default');
  safeSetVal('ipsec-modal-pfsgroup', conn.pfs_group || 'modp2048');
  safeSetChecked('ipsec-modal-autostart', conn.auto_start ?? true);
  safeSetChecked('ipsec-modal-disabled', !!conn.disabled);

  // Populate dynamic subnets
  const localContainer = document.getElementById('ipsec-modal-local-subnets-container');
  const remoteContainer = document.getElementById('ipsec-modal-remote-subnets-container');
  
  if (localContainer) {
    localContainer.innerHTML = '';
    const locals = (conn.local_subnets && conn.local_subnets.length > 0) ? conn.local_subnets : (conn.local_subnet ? [conn.local_subnet] : ['192.168.10.0/24']);
    locals.forEach(s => addIpsecLocalSubnet(s));
  }

  if (remoteContainer) {
    remoteContainer.innerHTML = '';
    const remotes = (conn.remote_subnets && conn.remote_subnets.length > 0) ? conn.remote_subnets : (conn.remote_subnet ? [conn.remote_subnet] : ['192.168.20.0/24']);
    remotes.forEach(s => addIpsecRemoteSubnet(s));
  }

  switchIpsecModalTab('p1');
  modal.classList.remove('hidden');
}

function closeAddIPSecModal() {
  const modal = document.getElementById('ipsec-modal');
  if (modal) modal.classList.add('hidden');
}

async function submitSaveIPSec(e) {
  if (e) e.preventDefault();
  const name = safeGetVal('ipsec-modal-name').trim();
  if (!name) {
    showToast('Error', 'Tunnel name is required', 'error');
    return;
  }
  const ikeVersion = safeGetVal('ipsec-modal-ikeversion') || safeGetVal('ipsec-modal-ikever', 'ikev2');
  const remotegw = safeGetVal('ipsec-modal-remotegw').trim();
  const localAddrs = safeGetVal('ipsec-modal-localaddrs').trim() || '%any';
  const comments = safeGetVal('ipsec-modal-comments').trim();
  const psk = safeGetVal('ipsec-modal-psk');
  const ikeProposals = safeGetVal('ipsec-modal-ikeprop', 'aes256-sha256-modp2048,default').trim();
  const ikeKeylife = parseInt(safeGetVal('ipsec-modal-ikekeylife', '86400'), 10) || 86400;
  const localId = safeGetVal('ipsec-modal-localid').trim();
  const remoteId = safeGetVal('ipsec-modal-remoteid').trim();
  const dpd = safeGetVal('ipsec-modal-dpd', 'on-demand');

  const phase2Name = safeGetVal('ipsec-modal-p2name').trim() || `${name}_p2`;
  const espProposals = safeGetVal('ipsec-modal-espprop', 'aes256-sha256-modp2048,default').trim();
  const espKeylife = parseInt(safeGetVal('ipsec-modal-espkeylife', '28800'), 10) || 28800;
  const pfsGroup = safeGetVal('ipsec-modal-pfsgroup', 'modp2048');
  const autostart = document.getElementById('ipsec-modal-autostart')?.checked ?? true;
  const disabled = document.getElementById('ipsec-modal-disabled')?.checked ?? false;

  // Scrape dynamic local and remote subnets
  const localInputs = document.querySelectorAll('#ipsec-modal-local-subnets-container input');
  const localSubnets = [];
  localInputs.forEach(inp => {
    const v = inp.value.trim();
    if (v) localSubnets.push(v);
  });

  const remoteInputs = document.querySelectorAll('#ipsec-modal-remote-subnets-container input');
  const remoteSubnets = [];
  remoteInputs.forEach(inp => {
    const v = inp.value.trim();
    if (v) remoteSubnets.push(v);
  });

  try {
    const res = await fetch(`${API_BASE}/vpn/ipsec/tunnels`, {
      method: 'POST',
      headers: { 'Content-Type': 'application/json' },
      body: JSON.stringify({
        name,
        comment: comments,
        ike_version: ikeVersion,
        local_addrs: localAddrs,
        remote_addrs: remotegw,
        preshared_key: psk,
        ike_proposals: ikeProposals,
        ike_keylife: ikeKeylife,
        local_id: localId,
        remote_id: remoteId,
        dpd: dpd,
        phase2_name: phase2Name,
        esp_proposals: espProposals,
        esp_keylife: espKeylife,
        pfs_group: pfsGroup,
        pfs: pfsGroup !== 'none',
        local_subnets: localSubnets,
        remote_subnets: remoteSubnets,
        local_subnet: localSubnets[0] || '0.0.0.0/0',
        remote_subnet: remoteSubnets[0] || '0.0.0.0/0',
        auto_start: autostart,
        disabled
      })
    });
    if (res.ok) {
      showToast('IPSec Saved', `FortiGate Tunnel ${name} configured`, 'success');
      closeAddIPSecModal();
      loadIPSec(false);
    } else {
      const err = await res.json();
      showToast('Error', err.error || 'Failed to save IPSec tunnel', 'error');
    }
  } catch (err) {
    showToast('Error', err.message, 'error');
  }
}

async function startIPSecTunnel(name) {
  try {
    const res = await fetch(`${API_BASE}/vpn/ipsec/tunnels/${encodeURIComponent(name)}/start`, { method: 'POST' });
    if (res.ok) {
      showToast('Initiating Tunnel', `Attempting SA handshake for ${name}...`, 'info');
      setTimeout(() => loadIPSec(false), 2000);
    }
  } catch (err) {
    showToast('Error', err.message, 'error');
  }
}

async function stopIPSecTunnel(name) {
  try {
    const res = await fetch(`${API_BASE}/vpn/ipsec/tunnels/${encodeURIComponent(name)}/stop`, { method: 'POST' });
    if (res.ok) {
      showToast('Terminated', `IPSec SA for ${name} closed`, 'info');
      loadIPSec(false);
    }
  } catch (err) {
    showToast('Error', err.message, 'error');
  }
}

async function toggleIPSecState(name, enable) {
  try {
    const res = await fetch(`${API_BASE}/vpn/ipsec/tunnels/${encodeURIComponent(name)}/state`, {
      method: 'POST',
      headers: { 'Content-Type': 'application/json' },
      body: JSON.stringify({ enabled: enable })
    });
    if (res.ok) {
      showToast(enable ? 'Enabled' : 'Disabled', `IPSec tunnel ${name} updated`, 'info');
      loadIPSec(false);
    }
  } catch (err) {
    showToast('Error', err.message, 'error');
  }
}

async function deleteIPSecConn(name) {
  if (!confirm(`Are you sure you want to delete IPSec tunnel ${name}?`)) return;
  try {
    const res = await fetch(`${API_BASE}/vpn/ipsec/tunnels/${encodeURIComponent(name)}`, { method: 'DELETE' });
    if (res.ok) {
      showToast('Deleted', `IPSec connection ${name} removed`, 'success');
      loadIPSec(false);
      fetchData(false);
    }
  } catch (err) {
    showToast('Error', err.message, 'error');
  }
}

// ======================== L2TP Multi-Instance ========================
async function loadL2TP(populateInputs = true) {
  try {
    if (!state.pppProfiles || state.pppProfiles.length === 0) {
      await fetchPPPProfilesList();
    }
    const res = await fetch(`${API_BASE}/vpn/l2tp/clients`);
    const list = await res.json();
    state.l2tpList = Array.isArray(list) ? list : [];

    const badge = document.getElementById('l2tp-count-badge');
    if (badge) badge.innerText = `${state.l2tpList.length} Client${state.l2tpList.length !== 1 ? 's' : ''}`;

    const tbody = document.getElementById('l2tp-table-body');
    const empty = document.getElementById('l2tp-empty');
    if (!tbody) return;
    tbody.innerHTML = '';

    if (state.l2tpList.length === 0) {
      if (empty) empty.classList.remove('hidden');
    } else {
      if (empty) empty.classList.add('hidden');
      state.l2tpList.forEach(inst => {
        const tr = document.createElement('tr');
        tr.className = 'hover:bg-slate-800/40 transition text-xs';
        tr.innerHTML = `
          <td class="py-2.5 px-3 text-center">${renderMikroTikFlag(inst.running, inst.disabled)}</td>
          <td class="py-2.5 px-3 font-bold text-white">${escapeHtml(inst.name)}</td>
          <td class="py-2.5 px-3 text-cyan-400 font-mono">${escapeHtml(inst.connect_to)}</td>
          <td class="py-2.5 px-3 text-slate-300 font-mono">${escapeHtml(inst.username || '-')}</td>
          <td class="py-2.5 px-3 font-mono text-cyan-300"><span class="px-1.5 py-0.5 rounded text-[10px] bg-slate-800 border border-slate-700">${escapeHtml(inst.profile || 'default-encryption')}</span></td>
          <td class="py-2.5 px-3 font-mono ${inst.assigned_ip ? 'text-emerald-400 font-bold' : 'text-slate-500'}">${escapeHtml(inst.assigned_ip || '-')}</td>
          <td class="py-2.5 px-3 text-slate-400 font-mono">${escapeHtml(inst.ppp_device || '-')}</td>
          <td class="py-2.5 px-3 text-center">
            <span class="px-2 py-0.5 rounded text-[10px] font-sans ${inst.default_route ? 'bg-cyan-500/20 text-cyan-300 border border-cyan-500/30' : 'bg-slate-800 text-slate-500'}">
              ${inst.default_route ? 'Yes' : 'No'}
            </span>
          </td>
          <td class="py-2.5 px-3 text-right space-x-2 font-sans">
            ${inst.running ? `
              <button onclick="disconnectL2TPInstance('${escapeHtml(inst.name)}')" class="text-xs text-rose-400 hover:text-rose-300">Disconnect</button>
            ` : `
              <button onclick="connectL2TPInstance('${escapeHtml(inst.name)}')" class="text-xs bg-cyan-600/30 hover:bg-cyan-600/50 text-cyan-300 px-2 py-0.5 rounded border border-cyan-500/30">Connect</button>
            `}
            <button onclick="toggleL2TPState('${escapeHtml(inst.name)}', ${inst.disabled ? 'true' : 'false'})" class="text-xs text-slate-400 hover:text-white">
              ${inst.disabled ? 'Enable' : 'Disable'}
            </button>
            <button onclick="openEditL2TPModal('${escapeHtml(inst.name)}')" class="text-xs text-slate-400 hover:text-white">Edit</button>
            <button onclick="deleteL2TPInstance('${escapeHtml(inst.name)}')" class="text-xs text-slate-500 hover:text-rose-400">Delete</button>
          </td>
        `;
        tbody.appendChild(tr);
      });
    }
  } catch (err) {
    console.error('Failed to load L2TP:', err);
  }
}

async function openAddL2TPModal() {
  if (!state.pppProfiles || state.pppProfiles.length === 0) {
    await fetchPPPProfilesList();
  }
  document.getElementById('l2tp-modal-title').innerText = 'Add L2TP Client Interface';
  document.getElementById('l2tp-modal-name').value = `l2tp-out${(state.l2tpList || []).length + 1}`;
  document.getElementById('l2tp-modal-name').readOnly = false;
  document.getElementById('l2tp-modal-server').value = '';
  document.getElementById('l2tp-modal-user').value = '';
  document.getElementById('l2tp-modal-pass').value = '';
  document.getElementById('l2tp-modal-ipsec').value = '';
  document.getElementById('l2tp-modal-defroute').checked = true;
  document.getElementById('l2tp-modal-disabled').checked = false;

  populateProfileSelect('l2tp-modal-profile', 'default-encryption', 'default-encryption');

  document.getElementById('l2tp-modal').classList.remove('hidden');
}

async function openEditL2TPModal(name) {
  if (!state.pppProfiles || state.pppProfiles.length === 0) {
    await fetchPPPProfilesList();
  }
  const inst = (state.l2tpList || []).find(i => i.name === name);
  if (!inst) return;

  document.getElementById('l2tp-modal-title').innerText = `Edit L2TP Client: ${name}`;
  document.getElementById('l2tp-modal-name').value = inst.name;
  document.getElementById('l2tp-modal-name').readOnly = true;
  document.getElementById('l2tp-modal-server').value = inst.connect_to || '';
  document.getElementById('l2tp-modal-user').value = inst.username || '';
  document.getElementById('l2tp-modal-pass').value = inst.password || '';
  document.getElementById('l2tp-modal-ipsec').value = inst.ipsec_secret || '';
  document.getElementById('l2tp-modal-defroute').checked = inst.default_route ?? true;
  document.getElementById('l2tp-modal-disabled').checked = !!inst.disabled;

  populateProfileSelect('l2tp-modal-profile', inst.profile || 'default-encryption', 'default-encryption');

  document.getElementById('l2tp-modal').classList.remove('hidden');
}

function closeL2TPModal() {
  document.getElementById('l2tp-modal').classList.add('hidden');
}

async function submitSaveL2TP(e) {
  e.preventDefault();
  const name = document.getElementById('l2tp-modal-name').value.trim();
  const server = document.getElementById('l2tp-modal-server').value.trim();
  const user = document.getElementById('l2tp-modal-user').value.trim();
  const pass = document.getElementById('l2tp-modal-pass').value;
  const profile = document.getElementById('l2tp-modal-profile')?.value || 'default-encryption';
  const ipsec = document.getElementById('l2tp-modal-ipsec').value;
  const defRoute = document.getElementById('l2tp-modal-defroute').checked;
  const disabled = document.getElementById('l2tp-modal-disabled').checked;

  try {
    const res = await fetch(`${API_BASE}/vpn/l2tp/clients`, {
      method: 'POST',
      headers: { 'Content-Type': 'application/json' },
      body: JSON.stringify({
        name,
        connect_to: server,
        username: user,
        password: pass,
        profile: profile,
        ipsec_secret: ipsec,
        default_route: defRoute,
        disabled
      })
    });
    if (res.ok) {
      showToast('L2TP Saved', `Client ${name} configuration saved`, 'success');
      closeL2TPModal();
      loadL2TP(false);
      fetchData(false);
    }
  } catch (err) {
    showToast('Error', err.message, 'error');
  }
}

async function connectL2TPInstance(name) {
  try {
    const res = await fetch(`${API_BASE}/vpn/l2tp/clients/${encodeURIComponent(name)}/connect`, { method: 'POST' });
    if (res.ok) {
      showToast('Connecting', `Dialing L2TP ${name}...`, 'info');
      setTimeout(() => loadL2TP(false), 2000);
    }
  } catch (err) {
    showToast('Error', err.message, 'error');
  }
}

async function disconnectL2TPInstance(name) {
  try {
    const res = await fetch(`${API_BASE}/vpn/l2tp/clients/${encodeURIComponent(name)}/disconnect`, { method: 'POST' });
    if (res.ok) {
      showToast('Disconnected', `L2TP tunnel ${name} terminated`, 'info');
      loadL2TP(false);
    }
  } catch (err) {
    showToast('Error', err.message, 'error');
  }
}

async function toggleL2TPState(name, enable) {
  try {
    const res = await fetch(`${API_BASE}/vpn/l2tp/clients/${encodeURIComponent(name)}/state`, {
      method: 'POST',
      headers: { 'Content-Type': 'application/json' },
      body: JSON.stringify({ enabled: enable })
    });
    if (res.ok) {
      showToast(enable ? 'Enabled' : 'Disabled', `${name} state updated`, 'info');
      loadL2TP(false);
    }
  } catch (err) {
    showToast('Error', err.message, 'error');
  }
}

async function deleteL2TPInstance(name) {
  if (!confirm(`Are you sure you want to delete L2TP client ${name}?`)) return;
  try {
    const res = await fetch(`${API_BASE}/vpn/l2tp/clients/${encodeURIComponent(name)}`, { method: 'DELETE' });
    if (res.ok) {
      showToast('Deleted', `L2TP client ${name} removed`, 'success');
      loadL2TP(false);
      fetchData(false);
    }
  } catch (err) {
    showToast('Error', err.message, 'error');
  }
}

// ======================== PPTP Multi-Instance ========================
async function loadPPTP(populateInputs = true) {
  try {
    if (!state.pppProfiles || state.pppProfiles.length === 0) {
      await fetchPPPProfilesList();
    }
    const res = await fetch(`${API_BASE}/vpn/pptp/clients`);
    const list = await res.json();
    state.pptpList = Array.isArray(list) ? list : [];

    const badge = document.getElementById('pptp-count-badge');
    if (badge) badge.innerText = `${state.pptpList.length} Client${state.pptpList.length !== 1 ? 's' : ''}`;

    const tbody = document.getElementById('pptp-table-body');
    const empty = document.getElementById('pptp-empty');
    if (!tbody) return;
    tbody.innerHTML = '';

    if (state.pptpList.length === 0) {
      if (empty) empty.classList.remove('hidden');
    } else {
      if (empty) empty.classList.add('hidden');
      state.pptpList.forEach(inst => {
        const tr = document.createElement('tr');
        tr.className = 'hover:bg-slate-800/40 transition text-xs';
        tr.innerHTML = `
          <td class="py-2.5 px-3 text-center">${renderMikroTikFlag(inst.running, inst.disabled)}</td>
          <td class="py-2.5 px-3 font-bold text-white">${escapeHtml(inst.name)}</td>
          <td class="py-2.5 px-3 text-purple-400 font-mono">${escapeHtml(inst.connect_to)}</td>
          <td class="py-2.5 px-3 text-slate-300 font-mono">${escapeHtml(inst.username || '-')}</td>
          <td class="py-2.5 px-3 font-mono text-purple-300"><span class="px-1.5 py-0.5 rounded text-[10px] bg-slate-800 border border-slate-700">${escapeHtml(inst.profile || 'default-encryption')}</span></td>
          <td class="py-2.5 px-3 font-mono ${inst.assigned_ip ? 'text-emerald-400 font-bold' : 'text-slate-500'}">${escapeHtml(inst.assigned_ip || '-')}</td>
          <td class="py-2.5 px-3 text-slate-400 font-mono">${escapeHtml(inst.ppp_device || '-')}</td>
          <td class="py-2.5 px-3 text-center">
            <span class="px-2 py-0.5 rounded text-[10px] font-sans ${inst.require_mppe ? 'bg-purple-500/20 text-purple-300 border border-purple-500/30' : 'bg-slate-800 text-slate-500'}">
              ${inst.require_mppe ? 'MPPE-128' : 'None'}
            </span>
          </td>
          <td class="py-2.5 px-3 text-right space-x-2 font-sans">
            ${inst.running ? `
              <button onclick="disconnectPPTPInstance('${escapeHtml(inst.name)}')" class="text-xs text-rose-400 hover:text-rose-300">Disconnect</button>
            ` : `
              <button onclick="connectPPTPInstance('${escapeHtml(inst.name)}')" class="text-xs bg-purple-600/30 hover:bg-purple-600/50 text-purple-300 px-2 py-0.5 rounded border border-purple-500/30">Connect</button>
            `}
            <button onclick="togglePPTPState('${escapeHtml(inst.name)}', ${inst.disabled ? 'true' : 'false'})" class="text-xs text-slate-400 hover:text-white">
              ${inst.disabled ? 'Enable' : 'Disable'}
            </button>
            <button onclick="openEditPPTPModal('${escapeHtml(inst.name)}')" class="text-xs text-slate-400 hover:text-white">Edit</button>
            <button onclick="deletePPTPInstance('${escapeHtml(inst.name)}')" class="text-xs text-slate-500 hover:text-rose-400">Delete</button>
          </td>
        `;
        tbody.appendChild(tr);
      });
    }
  } catch (err) {
    console.error('Failed to load PPTP:', err);
  }
}

async function openAddPPTPModal() {
  if (!state.pppProfiles || state.pppProfiles.length === 0) {
    await fetchPPPProfilesList();
  }
  document.getElementById('pptp-modal-title').innerText = 'Add PPTP Client Interface';
  document.getElementById('pptp-modal-name').value = `pptp-out${(state.pptpList || []).length + 1}`;
  document.getElementById('pptp-modal-name').readOnly = false;
  document.getElementById('pptp-modal-server').value = '';
  document.getElementById('pptp-modal-user').value = '';
  document.getElementById('pptp-modal-pass').value = '';
  document.getElementById('pptp-modal-mppe').checked = true;
  document.getElementById('pptp-modal-defroute').checked = true;
  document.getElementById('pptp-modal-disabled').checked = false;

  populateProfileSelect('pptp-modal-profile', 'default-encryption', 'default-encryption');

  document.getElementById('pptp-modal').classList.remove('hidden');
}

async function openEditPPTPModal(name) {
  if (!state.pppProfiles || state.pppProfiles.length === 0) {
    await fetchPPPProfilesList();
  }
  const inst = (state.pptpList || []).find(i => i.name === name);
  if (!inst) return;

  document.getElementById('pptp-modal-title').innerText = `Edit PPTP Client: ${name}`;
  document.getElementById('pptp-modal-name').value = inst.name;
  document.getElementById('pptp-modal-name').readOnly = true;
  document.getElementById('pptp-modal-server').value = inst.connect_to || '';
  document.getElementById('pptp-modal-user').value = inst.username || '';
  document.getElementById('pptp-modal-pass').value = inst.password || '';
  document.getElementById('pptp-modal-mppe').checked = inst.require_mppe ?? true;
  document.getElementById('pptp-modal-defroute').checked = inst.default_route ?? true;
  document.getElementById('pptp-modal-disabled').checked = !!inst.disabled;

  populateProfileSelect('pptp-modal-profile', inst.profile || 'default-encryption', 'default-encryption');

  document.getElementById('pptp-modal').classList.remove('hidden');
}

function closePPTPModal() {
  document.getElementById('pptp-modal').classList.add('hidden');
}

async function submitSavePPTP(e) {
  e.preventDefault();
  const name = document.getElementById('pptp-modal-name').value.trim();
  const server = document.getElementById('pptp-modal-server').value.trim();
  const user = document.getElementById('pptp-modal-user').value.trim();
  const pass = document.getElementById('pptp-modal-pass').value;
  const profile = document.getElementById('pptp-modal-profile')?.value || 'default-encryption';
  const mppe = document.getElementById('pptp-modal-mppe').checked;
  const defRoute = document.getElementById('pptp-modal-defroute').checked;
  const disabled = document.getElementById('pptp-modal-disabled').checked;

  try {
    const res = await fetch(`${API_BASE}/vpn/pptp/clients`, {
      method: 'POST',
      headers: { 'Content-Type': 'application/json' },
      body: JSON.stringify({
        name,
        connect_to: server,
        username: user,
        password: pass,
        profile: profile,
        require_mppe: mppe,
        default_route: defRoute,
        auto_reconnect: true,
        disabled
      })
    });
    if (res.ok) {
      showToast('PPTP Saved', `Client ${name} configuration saved`, 'success');
      closePPTPModal();
      loadPPTP(false);
      fetchData(false);
    }
  } catch (err) {
    showToast('Error', err.message, 'error');
  }
}

async function connectPPTPInstance(name) {
  try {
    const res = await fetch(`${API_BASE}/vpn/pptp/clients/${encodeURIComponent(name)}/connect`, { method: 'POST' });
    if (res.ok) {
      showToast('Connecting', `Dialing PPTP ${name}...`, 'info');
      setTimeout(() => loadPPTP(false), 2000);
    }
  } catch (err) {
    showToast('Error', err.message, 'error');
  }
}

async function disconnectPPTPInstance(name) {
  try {
    const res = await fetch(`${API_BASE}/vpn/pptp/clients/${encodeURIComponent(name)}/disconnect`, { method: 'POST' });
    if (res.ok) {
      showToast('Disconnected', `PPTP tunnel ${name} terminated`, 'info');
      loadPPTP(false);
    }
  } catch (err) {
    showToast('Error', err.message, 'error');
  }
}

async function togglePPTPState(name, enable) {
  try {
    const res = await fetch(`${API_BASE}/vpn/pptp/clients/${encodeURIComponent(name)}/state`, {
      method: 'POST',
      headers: { 'Content-Type': 'application/json' },
      body: JSON.stringify({ enabled: enable })
    });
    if (res.ok) {
      showToast(enable ? 'Enabled' : 'Disabled', `${name} state updated`, 'info');
      loadPPTP(false);
    }
  } catch (err) {
    showToast('Error', err.message, 'error');
  }
}

async function deletePPTPInstance(name) {
  if (!confirm(`Are you sure you want to delete PPTP client ${name}?`)) return;
  try {
    const res = await fetch(`${API_BASE}/vpn/pptp/clients/${encodeURIComponent(name)}`, { method: 'DELETE' });
    if (res.ok) {
      showToast('Deleted', `PPTP client ${name} removed`, 'success');
      loadPPTP(false);
      fetchData(false);
    }
  } catch (err) {
    showToast('Error', err.message, 'error');
  }
}

// ---------------- Modal & Helper Functions ----------------
function openVlanModal(defaultParent = '') {
  const select = document.getElementById('vlan-parent');
  select.innerHTML = '';
  const allIfaces = state.interfaces || [];
  const eligible = allIfaces.filter(i => supportsVLAN(i));

  if (eligible.length === 0) {
    const opt = document.createElement('option');
    opt.value = '';
    opt.innerText = 'No VLAN-capable interfaces available';
    select.appendChild(opt);
  } else {
    eligible.forEach(i => {
      const opt = document.createElement('option');
      opt.value = i.name;
      opt.innerText = `${i.name} (${i.role || i.type || 'Ethernet'} - ${i.state})`;
      if (i.name === defaultParent) opt.selected = true;
      select.appendChild(opt);
    });
  }

  document.getElementById('vlan-id').value = '';
  document.getElementById('vlan-name').value = '';
  document.getElementById('vlan-ip').value = '';
  document.getElementById('vlan-desc').value = '';
  populateRoleSelects('LAN');
  autoSuggestVlanName();
  document.getElementById('vlan-modal').classList.remove('hidden');
}

function closeVlanModal() {
  document.getElementById('vlan-modal').classList.add('hidden');
}

function autoSuggestVlanName() {
  const parent = document.getElementById('vlan-parent').value;
  if (!parent) return;
  const id = document.getElementById('vlan-id').value;
  const nameInput = document.getElementById('vlan-name');
  if (parent && id) nameInput.placeholder = `${parent}.${id}`;
}

function setSubnetPreset(cidr) {
  const ipInput = document.getElementById('vlan-ip');
  const id = document.getElementById('vlan-id').value || '10';
  ipInput.value = `192.168.${id}.1${cidr}`;
}

async function submitCreateVlan(e) {
  e.preventDefault();
  const btn = document.getElementById('vlan-submit-btn');
  btn.disabled = true;
  btn.innerText = 'Creating...';

  const parent = document.getElementById('vlan-parent').value;
  if (!parent) {
    showToast('Error', 'Please select a valid VLAN-capable parent interface', 'error');
    btn.disabled = false;
    btn.innerText = 'Create VLAN';
    return;
  }
  const id = parseInt(document.getElementById('vlan-id').value, 10);
  const name = document.getElementById('vlan-name').value.trim();
  const ip = document.getElementById('vlan-ip').value.trim();
  const role = document.getElementById('vlan-role').value;
  const desc = document.getElementById('vlan-desc').value.trim();

  try {
    const res = await fetch(`${API_BASE}/vlans`, {
      method: 'POST',
      headers: { 'Content-Type': 'application/json' },
      body: JSON.stringify({
        parent_name: parent,
        vlan_id: id,
        name: name,
        ip_address: ip,
        role: role,
        description: desc,
        mtu: 1500,
        auto_up: true
      })
    });
    const data = await res.json();
    if (res.ok) {
      showToast('VLAN Created', `Created ${data.name} (VLAN ${data.vlan_id})`, 'success');
      state.expandedParents.add(parent);
      closeVlanModal();
      await fetchData(true);
      if (state.activeTab !== 'interfaces') navigate('interfaces');
    } else {
      showToast('Creation Failed', data.message || 'Failed to create VLAN', 'error');
    }
  } catch (err) {
    showToast('Error', err.message, 'error');
  } finally {
    btn.disabled = false;
    btn.innerText = 'Create VLAN';
  }
}

async function confirmDeleteVlan(name) {
  if (!confirm(`Delete VLAN interface ${name}?`)) return;
  try {
    const res = await fetch(`${API_BASE}/vlans/${encodeURIComponent(name)}`, { method: 'DELETE' });
    if (res.ok) {
      showToast('VLAN Deleted', `Interface ${name} removed`, 'success');
      closeIfaceModal();
      fetchData(true);
    }
  } catch (err) {
    showToast('Error', err.message, 'error');
  }
}

function openIfaceModal(name) {
  const iface = (state.interfaces || []).find(i => i.name === name);
  if (!iface) return;

  state.currentModalIface = iface.name;
  document.getElementById('modal-iface-name').innerText = iface.name;
  document.getElementById('modal-iface-badge').innerText = iface.is_vlan ? `VLAN ${iface.vlan_id}` : iface.type;
  document.getElementById('modal-iface-mtu').value = iface.mtu;
  populateRoleSelects(iface.role || 'LAN');
  document.getElementById('modal-iface-desc').value = iface.description || '';

  const nameInput = document.getElementById('modal-iface-new-name');
  const renameBtn = document.getElementById('modal-btn-rename');
  const renameHelp = document.getElementById('modal-iface-rename-help');
  if (nameInput) {
    nameInput.value = iface.name;
    if (iface.name === 'lo' || iface.type === 'loopback') {
      nameInput.disabled = true;
      if (renameBtn) renameBtn.disabled = true;
      if (renameHelp) renameHelp.innerText = 'Loopback interface cannot be renamed.';
    } else {
      nameInput.disabled = false;
      if (renameBtn) renameBtn.disabled = false;
      if (renameHelp) renameHelp.innerText = 'Device name in Linux (max 15 characters). Automatically preserves operational link state and metadata.';
    }
  }

  const delBtn = document.getElementById('modal-delete-vlan-btn');
  if (iface.is_vlan) {
    delBtn.classList.remove('hidden');
  } else {
    delBtn.classList.add('hidden');
  }

  renderModalIPs(iface);
  document.getElementById('iface-modal').classList.remove('hidden');
}

function renderModalIPs(iface) {
  const container = document.getElementById('modal-ip-list');
  container.innerHTML = '';
  const addrs = [...(iface.ipv4 || []), ...(iface.ipv6 || [])];
  if (addrs.length === 0) {
    container.innerHTML = `<span class="text-slate-500 text-xs font-sans">No IP addresses currently bound</span>`;
    return;
  }
  addrs.forEach(addr => {
    const row = document.createElement('div');
    row.className = 'flex items-center justify-between p-2 rounded bg-slate-900 border border-slate-800';
    row.innerHTML = `
      <span class="text-white">${addr}</span>
      <button onclick="removeInterfaceIP('${addr}')" class="text-[11px] text-rose-400 hover:text-rose-300 font-sans">Remove</button>
    `;
    container.appendChild(row);
  });
}

function closeIfaceModal() {
  document.getElementById('iface-modal').classList.add('hidden');
  state.currentModalIface = null;
}

async function setIfaceState(name, newState) {
  const target = name || state.currentModalIface;
  if (!target) return;
  await toggleInterfaceState(target, newState);
  const updated = (state.interfaces || []).find(i => i.name === target);
  if (updated) openIfaceModal(target);
}

async function applyMTU() {
  const mtu = parseInt(document.getElementById('modal-iface-mtu').value, 10);
  try {
    const res = await fetch(`${API_BASE}/interfaces/${encodeURIComponent(state.currentModalIface)}/mtu`, {
      method: 'POST',
      headers: { 'Content-Type': 'application/json' },
      body: JSON.stringify({ mtu })
    });
    if (res.ok) {
      showToast('MTU Applied', `Set MTU to ${mtu} on ${state.currentModalIface}`, 'success');
      fetchData(false);
    }
  } catch (err) {
    showToast('Error', err.message, 'error');
  }
}

async function addInterfaceIP() {
  const ip = document.getElementById('modal-new-ip').value.trim();
  if (!ip) return;
  try {
    const res = await fetch(`${API_BASE}/interfaces/${encodeURIComponent(state.currentModalIface)}/ip`, {
      method: 'POST',
      headers: { 'Content-Type': 'application/json' },
      body: JSON.stringify({ ip })
    });
    if (res.ok) {
      showToast('IP Added', `Bound ${ip} to ${state.currentModalIface}`, 'success');
      document.getElementById('modal-new-ip').value = '';
      await fetchData(false);
      const iface = (state.interfaces || []).find(i => i.name === state.currentModalIface);
      if (iface) renderModalIPs(iface);
    } else {
      const err = await res.json();
      showToast('Error', err.error || err.message || 'Failed to add IP address', 'error');
    }
  } catch (err) {
    showToast('Error', err.message, 'error');
  }
}

async function removeInterfaceIP(ip) {
  if (!confirm(`Remove IP ${ip}?`)) return;
  try {
    const res = await fetch(`${API_BASE}/interfaces/${encodeURIComponent(state.currentModalIface)}/ip`, {
      method: 'DELETE',
      headers: { 'Content-Type': 'application/json' },
      body: JSON.stringify({ ip })
    });
    if (res.ok) {
      showToast('IP Removed', `Removed ${ip}`, 'success');
      await fetchData(false);
      const iface = (state.interfaces || []).find(i => i.name === state.currentModalIface);
      if (iface) renderModalIPs(iface);
    }
  } catch (err) {
    showToast('Error', err.message, 'error');
  }
}

async function renameInterface() {
  const oldName = state.currentModalIface;
  const newNameInput = document.getElementById('modal-iface-new-name');
  const newName = (newNameInput?.value || '').trim();

  if (!oldName) return;
  if (!newName) {
    showToast('Warning', 'Interface name cannot be empty', 'warning');
    return;
  }
  if (newName === oldName) {
    showToast('Info', `Interface name is already "${oldName}"`, 'info');
    return;
  }
  if (newName.length > 15) {
    showToast('Validation Error', 'Interface name cannot exceed 15 characters (Linux IFNAMSIZ)', 'error');
    return;
  }
  if (!/^[a-zA-Z0-9_][a-zA-Z0-9_.-]*$/.test(newName)) {
    showToast('Validation Error', 'Name must contain only alphanumeric characters, underscores, hyphens or dots', 'error');
    return;
  }

  const renameBtn = document.getElementById('modal-btn-rename');
  if (renameBtn) {
    renameBtn.disabled = true;
    renameBtn.innerHTML = `<span class="animate-spin inline-block mr-1">⟳</span> Renaming...`;
  }

  try {
    const res = await fetch(`${API_BASE}/interfaces/${encodeURIComponent(oldName)}/rename`, {
      method: 'POST',
      headers: { 'Content-Type': 'application/json' },
      body: JSON.stringify({ new_name: newName })
    });
    const data = await res.json();
    if (!res.ok) {
      showToast('Rename Failed', data.error || data.message || 'Failed to rename interface', 'error');
      return;
    }

    showToast('Interface Renamed', `Successfully renamed ${oldName} → ${newName}`, 'success');
    state.currentModalIface = newName;
    document.getElementById('modal-iface-name').innerText = newName;

    // Refresh application state
    await fetchData(false);
    const updated = (state.interfaces || []).find(i => i.name === newName);
    if (updated) {
      openIfaceModal(newName);
    } else {
      closeIfaceModal();
    }
  } catch (err) {
    showToast('Error', err.message, 'error');
  } finally {
    if (renameBtn) {
      renameBtn.disabled = false;
      renameBtn.innerHTML = `
        <svg class="w-3.5 h-3.5" fill="none" stroke="currentColor" viewBox="0 0 24 24"><path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M15.232 5.232l3.536 3.536m-2.036-5.036a2.5 2.5 0 113.536 3.536L6.5 21.036H3v-3.572L16.732 3.732z"/></svg>
        <span>Rename</span>
      `;
    }
  }
}

async function saveInterfaceMetadata() {
  const oldName = state.currentModalIface;
  const newName = (document.getElementById('modal-iface-new-name')?.value || '').trim();
  const role = document.getElementById('modal-iface-role').value;
  const desc = document.getElementById('modal-iface-desc').value.trim();

  let targetName = oldName;

  // If user changed the name before clicking Save Changes, execute rename first
  if (newName && newName !== oldName && oldName !== 'lo') {
    try {
      const renameRes = await fetch(`${API_BASE}/interfaces/${encodeURIComponent(oldName)}/rename`, {
        method: 'POST',
        headers: { 'Content-Type': 'application/json' },
        body: JSON.stringify({ new_name: newName })
      });
      const data = await renameRes.json();
      if (!renameRes.ok) {
        showToast('Rename Failed', data.error || data.message || 'Could not rename interface', 'error');
        return;
      }
      targetName = newName;
      state.currentModalIface = newName;
      showToast('Renamed', `Interface renamed from ${oldName} to ${newName}`, 'success');
    } catch (err) {
      showToast('Error', err.message, 'error');
      return;
    }
  }

  try {
    const res = await fetch(`${API_BASE}/interfaces/${encodeURIComponent(targetName)}/metadata`, {
      method: 'POST',
      headers: { 'Content-Type': 'application/json' },
      body: JSON.stringify({ role, description: desc })
    });
    if (res.ok) {
      showToast('Saved', 'Interface configuration updated', 'success');
      closeIfaceModal();
      fetchData(false);
    } else {
      const err = await res.json();
      showToast('Error', err.error || err.message || 'Failed to save metadata', 'error');
    }
  } catch (err) {
    showToast('Error', err.message, 'error');
  }
}

// ======================== IPTABLES FIREWALL ========================
state.fwSubTab = 'filter';
state.routesSubTab = 'routes';

function nativeNATChain(chain) {
  const value = (chain || '').toLowerCase();
  if (value === 'dstnat') return 'prerouting';
  if (value === 'srcnat') return 'postrouting';
  return ['prerouting', 'input', 'output', 'postrouting'].includes(value) ? value : (chain || '');
}

function nativeFirewallTarget(action) {
  const name = (action || '').toLowerCase();
  return ({'src-nat':'SNAT', 'dst-nat':'DNAT', 'add-src-to-address-list':'SET (add source)', 'add-dst-to-address-list':'SET (add destination)', 'mark-connection':'CONNMARK', 'mark-packet':'MARK', 'mark-routing':'MARK (routing)', 'change-dscp':'DSCP', 'change-mss':'TCPMSS', 'change-ttl':'TTL / HL', 'set-priority':'CLASSIFY', 'passthrough':'COUNT / continue', 'jump':'JUMP'})[name] || name.toUpperCase();
}

function renderRuleFlag(disabled, hasComment) {
  let flags = '';
  if (disabled) flags += '<span class="text-rose-400 font-bold" title="Disabled">X</span>';
  if (hasComment) flags += '<span class="text-amber-400 font-bold ml-1" title="Has Comment">C</span>';
  return flags || '<span class="text-slate-600">-</span>';
}

function renderActionBadge(action) {
  const act = (action || '').toLowerCase();
  let color = 'bg-slate-800 text-slate-300';
  if (act === 'accept') color = 'bg-emerald-500/20 text-emerald-300 border border-emerald-500/30';
  else if (act === 'drop' || act === 'reject') color = 'bg-rose-500/20 text-rose-300 border border-rose-500/30';
  else if (act === 'masquerade' || act === 'src-nat' || act === 'dst-nat') color = 'bg-amber-500/20 text-amber-300 border border-amber-500/30';
  else if (act.startsWith('mark-')) color = 'bg-purple-500/20 text-purple-300 border border-purple-500/30';
  else if (act === 'log') color = 'bg-cyan-500/20 text-cyan-300 border border-cyan-500/30';

  return `<span class="px-2 py-0.5 rounded text-[10px] font-mono font-semibold ${color}">${escapeHtml(nativeFirewallTarget(action))}</span>`;
}

function switchFWSubTab(tab) {
  state.fwSubTab = tab;
  const tabs = ['filter', 'nat', 'mangle', 'addrlist', 'geo', 'connections'];
  tabs.forEach(t => {
    const panel = document.getElementById(`fw-subtab-${t}`);
    const btn = document.getElementById(`fw-subtab-btn-${t}`);
    if (panel) {
      if (t === tab) panel.classList.remove('hidden');
      else panel.classList.add('hidden');
    }
    if (btn) {
      if (t === tab) {
        btn.className = 'px-4 py-2.5 text-xs font-bold border-b-2 border-emerald-500 text-white transition flex items-center gap-2 whitespace-nowrap';
      } else {
        btn.className = 'px-4 py-2.5 text-xs font-bold border-b-2 border-transparent text-slate-400 hover:text-slate-200 transition flex items-center gap-2 whitespace-nowrap';
      }
    }
  });

  const addBtn = document.getElementById('fw-primary-add-btn');
  if (addBtn) {
    if (tab === 'filter') addBtn.innerHTML = '<span>+ Add Filter Rule</span>';
    else if (tab === 'nat') addBtn.innerHTML = '<span>+ Add NAT Rule</span>';
    else if (tab === 'mangle') addBtn.innerHTML = '<span>+ Add Mangle Rule</span>';
    else if (tab === 'addrlist') addBtn.innerHTML = '<span>+ Add Address List</span>';
    else if (tab === 'geo') addBtn.innerHTML = '<span>⚙️ Schedule Settings</span>';
    else if (tab === 'connections') addBtn.innerHTML = '<span>Refresh Flows</span>';
  }

  if (tab === 'filter') renderFilterRules();
  else if (tab === 'nat') renderNATRules();
  else if (tab === 'mangle') renderMangleRules();
  else if (tab === 'addrlist') renderAddressLists();
  else if (tab === 'geo') loadGeoIP();
  else if (tab === 'connections') loadConnections();
  setTimeout(initTableSorting, 50);
}

function openCurrentFWModal() {
  if (state.fwSubTab === 'filter') openAddFilterModal();
  else if (state.fwSubTab === 'nat') openAddNATModal();
  else if (state.fwSubTab === 'mangle') openAddMangleModal();
  else if (state.fwSubTab === 'addrlist') openAddAddrListModal();
  else if (state.fwSubTab === 'geo') openGeoIntervalModal();
  else if (state.fwSubTab === 'connections') loadConnections();
}

async function loadFirewall(populateDropdowns = true) {
  try {
    const [summaryRes, filterRes, natRes, mangleRes, addrlistRes, geoStatusRes, geoCountriesRes] = await Promise.all([
      fetch(`${API_BASE}/firewall/summary`),
      fetch(`${API_BASE}/firewall/filter`),
      fetch(`${API_BASE}/firewall/nat`),
      fetch(`${API_BASE}/firewall/mangle`),
      fetch(`${API_BASE}/firewall/address-lists`),
      fetch(`${API_BASE}/firewall/geoip/status`),
      fetch(`${API_BASE}/firewall/geoip/countries`)
    ]);

    if (summaryRes.ok) state.fwSummary = await summaryRes.json();
    const applyError = document.getElementById('fw-apply-error');
    if (applyError) {
      applyError.textContent = state.fwSummary?.last_error ? 'Firewall configuration was not applied: ' + state.fwSummary.last_error : '';
      applyError.classList.toggle('hidden', !state.fwSummary?.last_error);
    }
    if (filterRes.ok) state.filterRules = await filterRes.json();
    if (natRes.ok) state.natRules = await natRes.json();
    if (mangleRes.ok) state.mangleRules = await mangleRes.json();
    if (addrlistRes.ok) state.addressLists = await addrlistRes.json();
    if (geoStatusRes.ok) state.geoStatus = await geoStatusRes.json();
    if (geoCountriesRes.ok) state.geoCountries = await geoCountriesRes.json();
    if (applyError) { const messages=[state.fwSummary?.last_error, state.fwSummary?.connections_error, state.geoStatus?.last_error && 'GeoIP: '+state.geoStatus.last_error].filter(Boolean); applyError.textContent=messages.join(' · '); applyError.classList.toggle('hidden', !messages.length); }

    // Badges
    const bFilter = document.getElementById('fw-badge-filter');
    if (bFilter) bFilter.innerText = (state.filterRules || []).length;
    const bNat = document.getElementById('fw-badge-nat');
    if (bNat) bNat.innerText = (state.natRules || []).length;
    const bMangle = document.getElementById('fw-badge-mangle');
    if (bMangle) bMangle.innerText = (state.mangleRules || []).length;
    const bAddr = document.getElementById('fw-badge-addrlist');
    if (bAddr) bAddr.innerText = (state.addressLists || []).length;
    const bGeo = document.getElementById('fw-badge-geo');
    if (bGeo) bGeo.innerText = state.geoStatus?.enabled_count || 0;

    const sigFilter = (state.filterRules || []).map(r => JSON.stringify({...r, packets: 0, bytes: 0})).join(';');
    const sigNat = (state.natRules || []).map(r => JSON.stringify({...r, packets: 0, bytes: 0})).join(';');
    const sigMangle = (state.mangleRules || []).map(r => JSON.stringify({...r, packets: 0, bytes: 0})).join(';');
    const sigAddr = (state.addressLists || []).map(a => JSON.stringify(a)).join(';');

    const tbodyFilter = document.getElementById('filter-table-body');
    if (tbodyFilter) {
      if (populateDropdowns || tbodyFilter.dataset.sig !== sigFilter) {
        tbodyFilter.dataset.sig = sigFilter;
        renderFilterRules();
      } else {
        // In-place live stats update (ZERO flicker)
        (state.filterRules || []).forEach(r => {
          const p = document.getElementById(`filter-pkts-${r.id}`);
          if (p) p.innerText = `${(r.packets || 0).toLocaleString()}p`;
          const b = document.getElementById(`filter-bytes-${r.id}`);
          if (b) b.innerText = formatTraffic(r.bytes || 0).replace('/s', '');
        });
      }
    }
    const tbodyNat = document.getElementById('nat-table-body');
    if (tbodyNat) {
      if (populateDropdowns || tbodyNat.dataset.sig !== sigNat) {
        tbodyNat.dataset.sig = sigNat;
        renderNATRules();
      } else {
        (state.natRules || []).forEach(r => {
          const p = document.getElementById(`nat-pkts-${r.id}`);
          if (p) p.innerText = `${(r.packets || 0).toLocaleString()}p`;
          const b = document.getElementById(`nat-bytes-${r.id}`);
          if (b) b.innerText = formatTraffic(r.bytes || 0).replace('/s', '');
        });
      }
    }
    const tbodyMangle = document.getElementById('mangle-table-body');
    if (tbodyMangle) {
      if (populateDropdowns || tbodyMangle.dataset.sig !== sigMangle) {
        tbodyMangle.dataset.sig = sigMangle;
        renderMangleRules();
      } else {
        (state.mangleRules || []).forEach(r => {
          const p = document.getElementById(`mangle-pkts-${r.id}`);
          if (p) p.innerText = `${(r.packets || 0).toLocaleString()}p`;
          const b = document.getElementById(`mangle-bytes-${r.id}`);
          if (b) b.innerText = formatTraffic(r.bytes || 0).replace('/s', '');
        });
      }
    }
    const tbodyAddr = document.getElementById('addrlist-table-body');
    if (tbodyAddr && (populateDropdowns || tbodyAddr.dataset.sig !== sigAddr)) {
      tbodyAddr.dataset.sig = sigAddr;
      renderAddressLists();
    }
    renderGeoCountries();

    if (state.fwSubTab === 'connections') {
      loadConnections();
    }
  } catch (err) {
    console.error('Failed to load firewall:', err);
  }
}

// ----------------- Filter Rules -----------------
function renderFilterRules() {
  const chainFilter = document.getElementById('filter-filter-chain')?.value || '';
  const tbody = document.getElementById('filter-table-body');
  const empty = document.getElementById('filter-empty');
  if (!tbody) return;
  tbody.innerHTML = '';

  const rules = (state.filterRules || []).filter(r => !chainFilter || (r.chain || '').toLowerCase() === chainFilter);
  document.getElementById('filter-count-badge').innerText = `${rules.length} Rules`;

  if (rules.length === 0) {
    empty?.classList.remove('hidden');
    return;
  }
  empty?.classList.add('hidden');

  rules.forEach((raw, idx) => {
    const r = safeFirewallRow(raw);
    const tr = document.createElement('tr');
    tr.className = `hover:bg-slate-800/40 transition text-xs ${r.disabled ? 'opacity-50' : ''}`;
    const ports = [r.src_port ? 's:' + r.src_port : '', r.dst_port ? 'd:' + r.dst_port : ''].filter(Boolean).join(' ');
    const ifaces = [r.in_interface ? 'in:' + r.in_interface : '', r.out_interface ? 'out:' + r.out_interface : ''].filter(Boolean).join(' ');

    let actionExtra = '';
    if (r.action === 'reject') {
      actionExtra = `<span class="block text-[10px] text-rose-300 font-mono mt-0.5">(${r.reject_with || 'icmp-net-unreach'})</span>`;
    } else if (r.action === 'jump') {
      actionExtra = `<span class="block text-[10px] text-yellow-300 font-mono mt-0.5">&rarr; ${r.jump_target || '-'}</span>`;
    } else if (r.action.includes('address-list') || r.action.includes('address list')) {
      actionExtra = `<span class="block text-[10px] text-emerald-300 font-mono mt-0.5">&rarr; ${r.address_list || '-'}</span>`;
    } else if (r.action === 'log' && r.log_prefix) {
      actionExtra = `<span class="block text-[10px] text-slate-400 font-mono mt-0.5">${r.log_prefix}</span>`;
    }

    tr.innerHTML = `
      <td class="py-2.5 px-3 text-center text-slate-500 font-bold">${r.order || idx + 1}</td>
      <td class="py-2.5 px-3 text-center">${renderRuleFlag(r.disabled, !!r.comment)}</td>
      <td class="py-2.5 px-3 font-bold text-white">${(r.chain || '').toUpperCase()}</td>
      <td class="py-2.5 px-3 text-slate-300">${formatTarget(r.src_address, r.src_address_list, r.src_geoip)}</td>
      <td class="py-2.5 px-3 text-slate-300">${formatTarget(r.dst_address, r.dst_address_list, r.dst_geoip)}</td>
      <td class="py-2.5 px-3 text-cyan-400 uppercase">${r.protocol || 'all'} <span class="text-[9px] text-slate-500">IPv${r.ip_version || 4}</span></td>
      <td class="py-2.5 px-3 text-amber-400">${ports || '-'}</td>
      <td class="py-2.5 px-3 text-emerald-400">${ifaces || '-'}</td>
      <td class="py-2.5 px-3">${renderActionBadge(r.action)}${actionExtra}</td>
      <td class="py-2.5 px-3 text-[11px] text-slate-400">
        <span class="text-slate-300" id="filter-pkts-${r.id}">${(r.packets || 0).toLocaleString()}p</span> / 
        <span class="text-slate-500" id="filter-bytes-${r.id}">${formatTraffic(r.bytes || 0).replace('/s', '')}</span>
      </td>
      <td class="py-2.5 px-3 text-slate-400 italic truncate max-w-[120px]" title="${r.comment || ''}">${r.comment || '-'}</td>
      <td class="py-2.5 px-3 text-right space-x-1.5 font-sans whitespace-nowrap">
        <button onclick="moveFilterRule('${r.id}', 'up')" class="text-xs text-slate-400 hover:text-white px-1">▲</button>
        <button onclick="moveFilterRule('${r.id}', 'down')" class="text-xs text-slate-400 hover:text-white px-1">▼</button>
        <button onclick="toggleFilterRuleState('${r.id}', ${!r.disabled})" class="text-xs ${r.disabled ? 'text-emerald-400' : 'text-slate-400'} hover:underline">${r.disabled ? 'Enable' : 'Disable'}</button>
        <button onclick="openEditFilterModal('${r.id}')" class="text-xs text-slate-400 hover:text-white">Edit</button>
        <button onclick="deleteFilterRule('${r.id}')" class="text-xs text-slate-500 hover:text-rose-400">Delete</button>
      </td>
    `;
    tbody.appendChild(tr);
  });
}

function formatTarget(addr, list, geo) {
  const parts = [];
  if (addr) parts.push(`<span>${addr}</span>`);
  if (list) {
    const inv = list.startsWith('!') ? '!' : '';
    const clean = list.replace(/^!/, '');
    parts.push(`<span class="px-1.5 py-0.5 rounded text-[10px] bg-amber-950/80 border border-amber-800/40 text-amber-300 font-mono" title="Address List: ${list}">${inv}list:${clean}</span>`);
  }
  if (geo) {
    const inv = geo.startsWith('!') ? '!' : '';
    const clean = geo.replace(/^!/, '').replace(/^geo:/, '');
    parts.push(`<span class="px-1.5 py-0.5 rounded text-[10px] bg-emerald-950/80 border border-emerald-800/40 text-emerald-300 font-mono" title="Geo-Location: ${geo}">🌍 ${inv}${clean}</span>`);
  }
  if (parts.length === 0) return '<span class="text-slate-600">0.0.0.0/0</span>';
  return parts.join(' ');
}

function populateInterfaceSelect(selectId, currentVal = '') {
  const sel = document.getElementById(selectId);
  if (!sel) return;
  sel.innerHTML = '<option value="">(Any Interface)</option>';
  (state.interfaces || []).forEach(i => {
    const opt = document.createElement('option');
    opt.value = i.name;
    opt.innerText = `${i.name} (${i.role || i.type})`;
    if (i.name === currentVal) opt.selected = true;
    sel.appendChild(opt);
  });
}

function populateAddressListSelect(selectId, currentVal = '') {
  const sel = document.getElementById(selectId);
  if (!sel) return;
  sel.innerHTML = '<option value="">(None)</option>';

  const cleanVal = (currentVal || '').replace(/^!/, '');
  const ruleLists = [...(state.filterRules||[]), ...(state.natRules||[]), ...(state.mangleRules||[])].flatMap(r => [r.src_address_list,r.dst_address_list,r.address_list]).filter(Boolean).map(n => n.replace(/^!/, '')).filter(n => !n.startsWith('geo:') && !n.startsWith('geo_'));
  const customNames = Array.from(new Set([...(state.addressLists || []).map(a => a.name), ...ruleLists])).sort();
  customNames.forEach(name => {
    const count = (state.addressLists || []).filter(a => a.name === name).length;
    const opt = document.createElement('option');
    opt.value = name;
    opt.innerText = `${name} (${count} entries)`;
    if (name === cleanVal) opt.selected = true;
    sel.appendChild(opt);
  });

  if (cleanVal && !Array.from(sel.options).some(option => option.value === cleanVal)) {
    const opt = document.createElement('option');
    opt.value = cleanVal;
    opt.innerText = cleanVal;
    opt.selected = true;
    sel.appendChild(opt);
  }
  populateCommonAddrListDatalist();
}

function populateCommonAddrListDatalist() {
  const dl = document.getElementById('fw-addrlist-datalist');
  if (!dl) return;
  dl.innerHTML = '';
  const names = Array.from(new Set((state.addressLists || []).map(a => a.name).filter(Boolean))).sort();
  names.forEach(name => {
    const opt = document.createElement('option');
    opt.value = name;
    dl.appendChild(opt);
  });
}

function populateGeoIPSelect(selectId, currentVal = '') {
  const sel = document.getElementById(selectId);
  if (!sel) return;
  sel.innerHTML = '<option value="">(None)</option>';

  const cleanVal = (currentVal || '').replace(/^!/, '').replace(/^geo:/, '').toUpperCase();

  // Presets optgroup
  const grpPresets = document.createElement('optgroup');
  grpPresets.label = '⚡ Regional Presets';
  const presets = [
    { code: 'EU', label: '🇪🇺 European Union (EU - 27 countries)' },
    { code: 'BALKANS', label: '🏛️ Balkans (GR, CY, BG, RO, AL, etc.)' },
    { code: 'BLOCKLIST', label: '🛡️ High-Risk Blocklist (CN, RU, IR, KP, BY)' }
  ];
  presets.forEach(p => {
    const opt = document.createElement('option');
    opt.value = p.code;
    opt.innerText = p.label;
    if (p.code === cleanVal) opt.selected = true;
    grpPresets.appendChild(opt);
  });
  sel.appendChild(grpPresets);

  // All Countries optgroup
  const grpCountries = document.createElement('optgroup');
  grpCountries.label = '🌍 All Countries';
  const countries = (state.geoCountries || []).slice().sort((a, b) => a.name.localeCompare(b.name));
  countries.forEach(c => {
    const opt = document.createElement('option');
    opt.value = c.code;
    const subnetsInfo = c.subnet_count ? ` [${c.subnet_count.toLocaleString()} subnets]` : '';
    opt.innerText = `${c.name} (${c.code})${subnetsInfo}`;
    if (c.code === cleanVal) opt.selected = true;
    grpCountries.appendChild(opt);
  });
  sel.appendChild(grpCountries);
}

// ==================== FIREWALL FILTER MODAL (DEBTIK WEBFIG / WINBOX V4) ====================

function switchFwRuleTab(tab) {
  state.activeFwRuleTab = tab;
  document.querySelectorAll('.fw-rule-tab-btn').forEach(btn => {
    btn.classList.remove('bg-[#182638]', 'text-white', 'border-sky-400');
    btn.classList.add('text-slate-400', 'border-transparent');
  });
  const activeBtn = document.getElementById(`fw-tab-btn-${tab}`);
  if (activeBtn) {
    activeBtn.classList.remove('text-slate-400', 'border-transparent');
    activeBtn.classList.add('bg-[#182638]', 'text-white', 'border-sky-400');
  }
  document.querySelectorAll('.fw-rule-pane').forEach(p => p.classList.add('hidden'));
  const activePane = document.getElementById(`fw-pane-${tab}`);
  if (activePane) activePane.classList.remove('hidden');

  if (tab === 'statistics') {
    startFwStatPolling();
  } else {
    stopFwStatPolling();
  }
}

function toggleFwField(fieldKey, expand) {
  const plusBtn = document.getElementById(`fw-plus-${fieldKey}`);
  const fieldBox = document.getElementById(`fw-field-${fieldKey}`);
  if (!plusBtn || !fieldBox) return;

  if (expand) {
    plusBtn.classList.add('hidden');
    fieldBox.classList.remove('hidden');
    const valInput = document.getElementById(`fw-val-${fieldKey}`);
    if (valInput) valInput.focus();
  } else {
    fieldBox.classList.add('hidden');
    plusBtn.classList.remove('hidden');
    const valInput = document.getElementById(`fw-val-${fieldKey}`);
    if (valInput) {
      if (valInput.tagName === 'SELECT') {
        valInput.selectedIndex = 0;
      } else {
        valInput.value = '';
      }
    }
    const invInput = document.getElementById(`fw-inv-${fieldKey}`);
    if (invInput) invInput.checked = false;

    if (fieldKey === 'cs') {
      ['filter-modal-cs-established', 'filter-modal-cs-related', 'filter-modal-cs-new', 'filter-modal-cs-invalid', 'filter-modal-cs-untracked'].forEach(id => {
        const el = document.getElementById(id);
        if (el) el.checked = false;
      });
    }
    if (fieldKey === 'natstate') {
      ['filter-modal-nat-srcnat', 'filter-modal-nat-dstnat'].forEach(id => {
        const el = document.getElementById(id);
        if (el) el.checked = false;
      });
    }
    if (fieldKey === 'days') {
      ['sun', 'mon', 'tue', 'wed', 'thu', 'fri', 'sat'].forEach(d => {
        const el = document.getElementById(`fw-day-${d}`);
        if (el) el.checked = true;
      });
    }
  }
}

function setFwFieldVal(fieldKey, value, hasInvert = false) {
  if (fieldKey === 'ipsec' && typeof value === 'string') value = value.replace(':', ',');
  if (value !== undefined && value !== null && value !== '' && !(fieldKey === 'proto' && value === 'all')) {
    toggleFwField(fieldKey, true);
    let strVal = String(value);
    if (hasInvert) {
      const inv = strVal.startsWith('!');
      if (inv) strVal = strVal.slice(1);
      const invEl = document.getElementById(`fw-inv-${fieldKey}`);
      if (invEl) invEl.checked = inv;
      else if (inv) strVal = '!'+strVal;
    }
    const valEl = document.getElementById(`fw-val-${fieldKey}`);
    if (valEl) { if (valEl.tagName === 'SELECT' && !Array.from(valEl.options).some(o => o.value === strVal)) { const option=document.createElement('option'); option.value=strVal; option.textContent=strVal+' (saved)'; valEl.appendChild(option); } valEl.value = strVal; }
  } else {
    toggleFwField(fieldKey, false);
  }
}

function getFwFieldVal(fieldKey, hasInvert = false) {
  const fieldBox = document.getElementById(`fw-field-${fieldKey}`);
  if (!fieldBox || fieldBox.classList.contains('hidden')) return '';
  const valEl = document.getElementById(`fw-val-${fieldKey}`);
  let v = valEl ? valEl.value.trim() : '';
  if (!v) return '';
  if (hasInvert) {
    const invEl = document.getElementById(`fw-inv-${fieldKey}`);
    if (invEl && invEl.checked) {
      v = '!' + v.replace(/^!/, '');
    }
  }
  return v;
}

function toggleMaximizeFilterModal() {
  const win = document.getElementById('filter-modal-window');
  if (!win) return;
  if (win.classList.contains('max-w-[720px]')) {
    win.classList.remove('max-w-[720px]', 'max-h-[92vh]');
    win.classList.add('max-w-[96vw]', 'h-[94vh]');
  } else {
    win.classList.remove('max-w-[96vw]', 'h-[94vh]');
    win.classList.add('max-w-[720px]', 'max-h-[92vh]');
  }
}

const FW_NATIVE_CHAINS = {
  filter: [
    { id: 'forward', label: 'FORWARD (routed through router)' },
    { id: 'input', label: 'INPUT (destined to this router)' },
    { id: 'output', label: 'OUTPUT (generated by this router)' }
  ],
  nat: [
    { id: 'postrouting', label: 'POSTROUTING (outgoing after routing — SNAT / MASQUERADE)' },
    { id: 'prerouting', label: 'PREROUTING (incoming before routing — DNAT / REDIRECT)' },
    { id: 'output', label: 'OUTPUT (locally generated — DNAT / REDIRECT)' },
    { id: 'input', label: 'INPUT (destined to this machine — SNAT)' }
  ],
  mangle: [
    { id: 'prerouting', label: 'PREROUTING (incoming before routing)' },
    { id: 'input', label: 'INPUT (destined to this machine)' },
    { id: 'forward', label: 'FORWARD (routed through router)' },
    { id: 'output', label: 'OUTPUT (generated by this machine)' },
    { id: 'postrouting', label: 'POSTROUTING (outgoing after routing)' }
  ]
};

function populateChainDropdown(table, currentChain) {
  const sel = document.getElementById(`${table}-modal-chain-select`);
  if (!sel) return;
  const cur = (currentChain || '').trim();
  const lower = cur.toLowerCase();

  const rulesKey = table === 'filter' ? 'filterRules' : table === 'nat' ? 'natRules' : 'mangleRules';
  const rules = state[rulesKey] || [];
  const nativeIds = FW_NATIVE_CHAINS[table].map(c => c.id);
  const customChains = new Set();
  rules.forEach(r => {
    if (r.chain) {
      const c = r.chain.trim();
      const l = c.toLowerCase();
      if (!nativeIds.includes(l) && l !== 'srcnat' && l !== 'dstnat' && !['forward', 'input', 'output', 'prerouting', 'postrouting'].includes(l)) {
        customChains.add(c);
      }
    }
  });

  const isCurrentCustom = cur && !nativeIds.includes(lower) && lower !== 'srcnat' && lower !== 'dstnat' && !['forward', 'input', 'output', 'prerouting', 'postrouting'].includes(lower);
  if (isCurrentCustom) {
    customChains.add(cur);
  }

  let html = '';
  FW_NATIVE_CHAINS[table].forEach(c => {
    html += `<option value="${c.id}">${escapeHtml(c.label)}</option>`;
  });
  if (customChains.size > 0) {
    html += `<optgroup label="Custom Chains">`;
    customChains.forEach(c => {
      html += `<option value="${escapeHtml(c)}">Chain: ${escapeHtml(c)} (custom)</option>`;
    });
    html += `</optgroup>`;
  }
  html += `<option value="__custom__">+ Custom Chain...</option>`;
  sel.innerHTML = html;

  if (isCurrentCustom) {
    sel.value = cur;
  } else if (nativeIds.includes(lower)) {
    sel.value = lower;
  } else if (table === 'nat' && (lower === 'srcnat' || lower === 'dstnat')) {
    sel.value = lower === 'dstnat' ? 'prerouting' : 'postrouting';
  } else {
    sel.value = nativeIds[0];
  }

  const customWrap = document.getElementById(`${table}-modal-custom-wrap`);
  const customInput = document.getElementById(`${table}-modal-custom-input`);
  if (isCurrentCustom || sel.value === '__custom__') {
    if (customWrap) customWrap.classList.remove('hidden');
    if (customInput) customInput.value = cur;
  } else {
    if (customWrap) customWrap.classList.add('hidden');
    if (customInput) customInput.value = '';
  }

  const chainInput = document.getElementById(`${table}-modal-chain`);
  if (chainInput) chainInput.value = cur || sel.value;
}

function syncFilterChainFromSelect() {
  const sel = document.getElementById('filter-modal-chain-select');
  const customWrap = document.getElementById('filter-modal-custom-wrap');
  const customInput = document.getElementById('filter-modal-custom-input');
  const chainInput = document.getElementById('filter-modal-chain');
  if (!sel || !chainInput) return;

  if (sel.value === '__custom__') {
    if (customWrap) customWrap.classList.remove('hidden');
    if (customInput) {
      customInput.value = '';
      customInput.focus();
    }
    chainInput.value = '';
  } else {
    if (customWrap) customWrap.classList.add('hidden');
    chainInput.value = sel.value;
  }
  handleFilterChainChange();
}

function syncFilterCustomChainInput() {
  const customInput = document.getElementById('filter-modal-custom-input');
  const chainInput = document.getElementById('filter-modal-chain');
  if (customInput && chainInput) {
    chainInput.value = customInput.value.trim();
  }
  handleFilterChainChange();
}

function handleFilterChainChange() {
  const chainInput = document.getElementById('filter-modal-chain');
  const chain = (chainInput?.value || 'forward').trim().toLowerCase();

  const sel = document.getElementById('filter-modal-chain-select');
  if (sel && sel.value !== chain && sel.value !== '__custom__') {
    if (['forward', 'input', 'output'].includes(chain)) {
      sel.value = chain;
    }
  }

  const hintEl = document.getElementById('filter-chain-hint');
  if (hintEl) {
    if (chain === 'forward') {
      hintEl.textContent = 'FORWARD: packets routed through this router (accepts both In and Out interfaces).';
    } else if (chain === 'input') {
      hintEl.textContent = 'INPUT: packets destined to this router (In-Interface only; Out-Interface is invalid in iptables).';
    } else if (chain === 'output') {
      hintEl.textContent = 'OUTPUT: packets generated by this router (Out-Interface only; In-Interface is invalid in iptables).';
    } else {
      hintEl.textContent = `Custom chain "${chain}": reached via an explicit JUMP from a built-in chain.`;
    }
  }

  const rowIn = document.getElementById('fw-row-iniface');
  const rowInList = document.getElementById('fw-row-inifacelist');
  const rowOut = document.getElementById('fw-row-outiface');
  const rowOutList = document.getElementById('fw-row-outifacelist');
  const rowInBridge = document.getElementById('fw-row-inbridgeport');
  const rowOutBridge = document.getElementById('fw-row-outbridgeport');
  const rowSrcMac = document.getElementById('fw-row-srcmac');

  if (chain === 'input') {
    if (rowIn) rowIn.classList.remove('hidden');
    if (rowInList) rowInList.classList.remove('hidden');
    if (rowOut) rowOut.classList.add('hidden');
    if (rowOutList) rowOutList.classList.add('hidden');
    if (rowInBridge) rowInBridge.classList.remove('hidden');
    if (rowOutBridge) rowOutBridge.classList.add('hidden');
    if (rowSrcMac) rowSrcMac.classList.remove('hidden');
  } else if (chain === 'output') {
    if (rowIn) rowIn.classList.add('hidden');
    if (rowInList) rowInList.classList.add('hidden');
    if (rowOut) rowOut.classList.remove('hidden');
    if (rowOutList) rowOutList.classList.remove('hidden');
    if (rowInBridge) rowInBridge.classList.add('hidden');
    if (rowOutBridge) rowOutBridge.classList.remove('hidden');
    if (rowSrcMac) rowSrcMac.classList.add('hidden');
  } else {
    if (rowIn) rowIn.classList.remove('hidden');
    if (rowInList) rowInList.classList.remove('hidden');
    if (rowOut) rowOut.classList.remove('hidden');
    if (rowOutList) rowOutList.classList.remove('hidden');
    if (rowInBridge) rowInBridge.classList.remove('hidden');
    if (rowOutBridge) rowOutBridge.classList.remove('hidden');
    if (rowSrcMac) rowSrcMac.classList.remove('hidden');
  }

  checkFilterActionChainCompatibility();
}

function checkFilterActionChainCompatibility() {
  const chain = (document.getElementById('filter-modal-chain')?.value || 'forward').trim().toLowerCase();
  const warnBox = document.getElementById('filter-action-incompatible-warn');
  const warnMsg = document.getElementById('filter-action-incompatible-msg');
  if (!warnBox || !warnMsg) return;

  if (chain === 'prerouting' || chain === 'postrouting') {
    warnMsg.textContent = `Chain "${chain.toUpperCase()}" is not available in the Filter table. Filter only supports INPUT, FORWARD, OUTPUT or custom chains.`;
    warnBox.classList.remove('hidden');
  } else {
    warnBox.classList.add('hidden');
  }
}

function openAddFilterModal() {
  const tos = document.getElementById('fw-val-tos'); if (tos) tos.value = '';
  switchFwRuleTab('general');
  setFirewallDays('fw', '');
  const badge = document.getElementById('fw-modal-badge');
  if (badge) badge.innerText = 'New...';
  document.getElementById('filter-modal-id').value = '';
  document.getElementById('filter-modal-family').value = '4';
  document.getElementById('filter-modal-enabled').checked = true;
  document.getElementById('filter-modal-comment').value = '';
  document.getElementById('filter-modal-chain').value = 'forward';
  populateChainDropdown('filter', 'forward');
  handleFilterChainChange();
  document.getElementById('filter-modal-action').value = 'accept';
  document.getElementById('filter-modal-log').checked = false;

  populateInterfaceSelect('fw-val-iniface');
  populateInterfaceSelect('fw-val-outiface');
  populateAddressListSelect('fw-val-srclist');
  populateAddressListSelect('fw-val-dstlist');
  populateGeoIPSelect('fw-val-srcgeo');
  populateGeoIPSelect('fw-val-dstgeo');

  const allFieldKeys = [
    'src', 'dst', 'srclist', 'dstlist', 'srcgeo', 'dstgeo', 'proto', 'sport', 'dport', 'anyport',
    'iniface', 'outiface', 'inifacelist', 'outifacelist', 'pktmark', 'connmark',
    'routingmark', 'conntype', 'cs', 'natstate',
    'layer7', 'content', 'connbytes', 'connrate', 'pcc', 'srcmac',
    'outbridgeport', 'inbridgeport', 'inbridgeportlist', 'outbridgeportlist',
    'ipsec', 'tlshost', 'ingresspriority', 'priority', 'dscp', 'tcpmss',
    'pktsize', 'random', 'tcpflags', 'icmpoptions', 'ipv4options', 'ttl',
    'time', 'days', 'limit', 'dstlimit', 'psd', 'logprefix'
  ];
  allFieldKeys.forEach(k => toggleFwField(k, false));

  resetRuleCounterDisplay();
  toggleFilterActionFields();

  refreshFirewallRejectTypes();
  document.getElementById('filter-modal').classList.remove('hidden');
}

function openEditFilterModal(id) {
  id = decodeURIComponent(id);
  const r = (state.filterRules || []).find(rule => rule.id === id);
  if (!r) return;

  switchFwRuleTab('general');
  const badge = document.getElementById('fw-modal-badge');
  if (badge) badge.innerText = `#${r.order != null ? r.order : r.id}`;

  document.getElementById('filter-modal-id').value = r.id;
  document.getElementById('filter-modal-family').value = String(r.ip_version || 4);
  document.getElementById('filter-modal-enabled').checked = !r.disabled;
  document.getElementById('filter-modal-comment').value = r.comment || '';
  const filterChain = r.chain || 'forward';
  document.getElementById('filter-modal-chain').value = filterChain;
  populateChainDropdown('filter', filterChain);
  handleFilterChainChange();
  setFirewallActionSelection('filter', r.action || 'accept');
  document.getElementById('filter-modal-log').checked = !!r.log;

  populateInterfaceSelect('fw-val-iniface', (r.in_interface || '').replace(/^!/, ''));
  populateInterfaceSelect('fw-val-outiface', (r.out_interface || '').replace(/^!/, ''));
  populateAddressListSelect('fw-val-srclist', (r.src_address_list || '').replace(/^!/, ''));
  populateAddressListSelect('fw-val-dstlist', (r.dst_address_list || '').replace(/^!/, ''));
  populateGeoIPSelect('fw-val-srcgeo', r.src_geoip || '');
  populateGeoIPSelect('fw-val-dstgeo', r.dst_geoip || '');

  setFwFieldVal('src', r.src_address, true);
  setFwFieldVal('dst', r.dst_address, true);
  setFwFieldVal('srclist', r.src_address_list, true);
  setFwFieldVal('dstlist', r.dst_address_list, true);
  setFwFieldVal('srcgeo', r.src_geoip, true);
  setFwFieldVal('dstgeo', r.dst_geoip, true);
  if (r.protocol && r.protocol !== 'all') {
    setFwFieldVal('proto', r.protocol, true);
  } else {
    toggleFwField('proto', false);
  }
  setFwFieldVal('sport', r.src_port, true);
  setFwFieldVal('dport', r.dst_port, true);
  setFwFieldVal('anyport', r.any_port, true);
  setFwFieldVal('iniface', r.in_interface, true);
  setFwFieldVal('outiface', r.out_interface, true);
  setFwFieldVal('inifacelist', r.in_interface_list, true);
  setFwFieldVal('outifacelist', r.out_interface_list, true);
  setFwFieldVal('pktmark', r.packet_mark, true);
  setFwFieldVal('connmark', r.connection_mark, true);
  setFwFieldVal('routingmark', r.routing_mark, true);
  setFwFieldVal('conntype', r.connection_type, false);

  const states = r.connection_state || [];
  if (states.length > 0) {
    toggleFwField('cs', true);
    document.getElementById('filter-modal-cs-established').checked = states.includes('established');
    document.getElementById('filter-modal-cs-related').checked = states.includes('related');
    document.getElementById('filter-modal-cs-new').checked = states.includes('new');
    document.getElementById('filter-modal-cs-invalid').checked = states.includes('invalid');
    document.getElementById('filter-modal-cs-untracked').checked = states.includes('untracked');
  } else {
    toggleFwField('cs', false);
  }

  const natStates = r.connection_nat_state || [];
  if (natStates.length > 0) {
    toggleFwField('natstate', true);
    document.getElementById('filter-modal-nat-srcnat').checked = natStates.includes('srcnat');
    document.getElementById('filter-modal-nat-dstnat').checked = natStates.includes('dstnat');
  } else {
    toggleFwField('natstate', false);
  }

  // Advanced tab fields
  setFwFieldVal('layer7', r.layer7_protocol, false);
  setFwFieldVal('content', r.content, false);
  setFwFieldVal('connbytes', r.connection_bytes, false);
  setFwFieldVal('connrate', r.connection_rate, false);
  setFwFieldVal('pcc', r.pcc, false);
  setFwFieldVal('srcmac', r.src_mac_address, true);
  setFwFieldVal('outbridgeport', r.out_bridge_port, false);
  setFwFieldVal('inbridgeport', r.in_bridge_port, false);
  setFwFieldVal('inbridgeportlist', r.in_bridge_port_list, false);
  setFwFieldVal('outbridgeportlist', r.out_bridge_port_list, false);
  setFwFieldVal('ipsec', r.ipsec_policy, false);
  setFwFieldVal('tlshost', r.tls_host, false);
  setFwFieldVal('ingresspriority', r.ingress_priority, false);
  setFwFieldVal('priority', r.priority, false);
  setFwFieldVal('dscp', r.dscp, false);
  setFwFieldVal('tcpmss', r.tcp_mss, false);
  { const tosEl = document.getElementById('fw-val-tos'); if (tosEl) tosEl.value = r.tos || ''; }
  setFwFieldVal('pktsize', r.packet_size, false);
  setFwFieldVal('random', r.random, false);
  setFwFieldVal('tcpflags', r.tcp_flags, false);
  setFwFieldVal('icmpoptions', r.icmp_options, false);
  setFwFieldVal('ipv4options', r.ipv4_options, false);
  setFwFieldVal('ttl', r.ttl, false);

  // Extra tab fields
  setFwFieldVal('time', r.time, false);
  if (r.days) {
    toggleFwField('days', true);
    ['sun', 'mon', 'tue', 'wed', 'thu', 'fri', 'sat'].forEach(d => {
      const chk = document.getElementById(`fw-day-${d}`);
      if (chk) chk.checked = r.days.toLowerCase().includes(d);
    });
  } else {
    toggleFwField('days', false);
  }
  setFwFieldVal('limit', r.limit, false);
  setFwFieldVal('dstlimit', r.dst_limit, false);
  setFwFieldVal('psd', r.psd, false);

  // Action fields
  if (r.reject_with) {
    const rwEl = document.getElementById('filter-modal-rejectwith');
    if (rwEl) rwEl.value = r.reject_with;
  }
  if (r.jump_target) {
    const jtEl = document.getElementById('filter-modal-jumptarget');
    if (jtEl) jtEl.value = r.jump_target;
  }
  if (r.address_list) {
    const alEl = document.getElementById('filter-modal-action-addrlist');
    if (alEl) alEl.value = r.address_list;
  }
  if (r.address_list_timeout) {
    const toEl = document.getElementById('filter-modal-action-timeout');
    if (toEl) toEl.value = r.address_list_timeout;
  }
  setFwFieldVal('logprefix', r.log_prefix, false);

  // Statistics
  const bEl = document.getElementById('fw-stat-bytes');
  const pEl = document.getElementById('fw-stat-packets');
  if (bEl) bEl.value = formatTraffic(r.bytes || 0).replace('/s', '');
  if (pEl) pEl.value = (r.packets || 0).toLocaleString();
  state.fwLastBytes = r.bytes || 0;
  state.fwLastPackets = r.packets || 0;
  state.fwLastTimestamp = Date.now();
  state.fwStatRateHistory = new Array(30).fill(0);
  state.fwStatPktHistory = new Array(30).fill(0);
  renderFwSparkline('fw-stat-rate-svg', state.fwStatRateHistory, 'bps', 'fw-stat-legend-rate');
  renderFwSparkline('fw-stat-pktrate-svg', state.fwStatPktHistory, 'p/s', 'fw-stat-legend-pktrate');

  toggleFilterActionFields();
  refreshFirewallRejectTypes();
  document.getElementById('filter-modal').classList.remove('hidden');
}

function closeFilterModal() {
  stopFwStatPolling();
  document.getElementById('filter-modal').classList.add('hidden');
}

function toggleFilterActionFields() {
  const act = document.getElementById('filter-modal-action')?.value || 'accept';
  const rejectBox = document.getElementById('filter-action-reject-box');
  const jumpBox = document.getElementById('filter-action-jump-box');
  const addrBox = document.getElementById('filter-action-addrlist-box');

  if (rejectBox) {
    if (act === 'reject') rejectBox.classList.remove('hidden');
    else rejectBox.classList.add('hidden');
  }
  if (jumpBox) {
    if (act === 'jump') jumpBox.classList.remove('hidden');
    else jumpBox.classList.add('hidden');
  }
  if (addrBox) {
    if (act === 'add-dst-to-address-list' || act === 'add-src-to-address-list' || act.includes('address-list') || act.includes('address list')) {
      addrBox.classList.remove('hidden');
    } else {
      addrBox.classList.add('hidden');
    }
  }
  if (act === 'log') {
    const logEl = document.getElementById('filter-modal-log');
    if (logEl) logEl.checked = true;
    toggleFwField('logprefix', true);
  }
}

function toggleFwLogPrefix() {
  const isLog = document.getElementById('filter-modal-log')?.checked;
  toggleFwField('logprefix', !!isLog);
}

function copyFilterRule() {
  document.getElementById('filter-modal-id').value = '';
  const badge = document.getElementById('fw-modal-badge');
  if (badge) badge.innerText = 'New...';
  showToast('Rule Cloned', 'Ready to save as a new rule copy', 'info');
}

function resetRuleCounterDisplay() {
  state.fwStatRateHistory = new Array(30).fill(0);
  state.fwStatPktHistory = new Array(30).fill(0);
  state.fwLastBytes = 0;
  state.fwLastPackets = 0;
  state.fwLastTimestamp = Date.now();
  const bEl = document.getElementById('fw-stat-bytes');
  const pEl = document.getElementById('fw-stat-packets');
  const rEl = document.getElementById('fw-stat-rate');
  const prEl = document.getElementById('fw-stat-pktrate');
  if (bEl) bEl.value = '0 B';
  if (pEl) pEl.value = '0';
  if (rEl) rEl.value = '0 bps';
  if (prEl) prEl.value = '0 p/s';
  renderFwSparkline('fw-stat-rate-svg', state.fwStatRateHistory, 'bps', 'fw-stat-legend-rate');
  renderFwSparkline('fw-stat-pktrate-svg', state.fwStatPktHistory, 'p/s', 'fw-stat-legend-pktrate');
  showToast('Counters Reset', 'Rule counter display reset to 0', 'info');
}

async function resetAllFwCounters() {
  try {
    const res = await fetch(`${API_BASE}/firewall/reset-counters`, { method: 'POST' });
    if (res.ok) {
      resetRuleCounterDisplay();
      showToast('All Counters Reset', 'All firewall counters zeroed', 'success');
      loadFirewall(false);
    }
  } catch (err) {
    showToast('Error', err.message, 'error');
  }
}

async function applyFilterRule(closeAfter = false) {
  const id = document.getElementById('filter-modal-id').value;
  if (!reviewLegacyFirewallSettings('filter', id)) return;
  let selectedDays; try { selectedDays = getFirewallDays('fw'); } catch(error) { showToast('Error', error.message, 'error'); return; }
  const chain = (document.getElementById('filter-modal-chain').value || '').trim();
  const chainLower = chain.toLowerCase();
  if (!chain) { switchFwRuleTab('general'); showToast('Filter Rule', 'A valid chain is required.', 'error'); document.getElementById('filter-modal-chain').focus(); return; }
  if (chainLower === 'prerouting' || chainLower === 'postrouting') {
    switchFwRuleTab('general');
    showToast('Invalid Chain', `Chain "${chain.toUpperCase()}" is not available in the Filter table in iptables.`, 'error');
    return;
  }
  const action = document.getElementById('filter-modal-action').value;
  const comment = document.getElementById('filter-modal-comment').value.trim();
  const enabled = document.getElementById('filter-modal-enabled').checked;

  const src = getFwFieldVal('src', true);
  const dst = getFwFieldVal('dst', true);
  const srclist = getFwFieldVal('srclist', true);
  const dstlist = getFwFieldVal('dstlist', true);
  const srcgeo = getFwFieldVal('srcgeo', true);
  const dstgeo = getFwFieldVal('dstgeo', true);
  const proto = getFwFieldVal('proto', true);
  const sport = getFwFieldVal('sport', true);
  const dport = getFwFieldVal('dport', true);
  const anyport = getFwFieldVal('anyport', true);
  if ((sport || dport || anyport) && !['tcp', 'udp'].includes(proto)) {
    switchFwRuleTab('general'); toggleFwField('proto', true);
    showToast('Select protocol', 'Port matches require TCP or UDP without protocol inversion.', 'error'); document.getElementById('fw-val-proto').focus(); return;
  }
  let iniface = getFwFieldVal('iniface', true);
  let outiface = getFwFieldVal('outiface', true);
  let inifacelist = getFwFieldVal('inifacelist', true);
  let outifacelist = getFwFieldVal('outifacelist', true);
  if (chainLower === 'input') {
    outiface = '';
    outifacelist = '';
  } else if (chainLower === 'output') {
    iniface = '';
    inifacelist = '';
  }
  const pktmark = getFwFieldVal('pktmark', true);
  const connmark = getFwFieldVal('connmark', true);
  const routingmark = getFwFieldVal('routingmark', true);
  const conntype = getFwFieldVal('conntype', false);

  const states = [];
  const csBox = document.getElementById('fw-field-cs');
  if (csBox && !csBox.classList.contains('hidden')) {
    if (document.getElementById('filter-modal-cs-established')?.checked) states.push('established');
    if (document.getElementById('filter-modal-cs-related')?.checked) states.push('related');
    if (document.getElementById('filter-modal-cs-new')?.checked) states.push('new');
    if (document.getElementById('filter-modal-cs-invalid')?.checked) states.push('invalid');
    if (document.getElementById('filter-modal-cs-untracked')?.checked) states.push('untracked');
  }

  const natStates = [];
  const natBox = document.getElementById('fw-field-natstate');
  if (natBox && !natBox.classList.contains('hidden')) {
    if (document.getElementById('filter-modal-nat-srcnat')?.checked) natStates.push('srcnat');
    if (document.getElementById('filter-modal-nat-dstnat')?.checked) natStates.push('dstnat');
  }

  const payload = {
    ip_version: Number(document.getElementById('filter-modal-family').value),
    id,
    chain,
    action,
    protocol: proto || 'all',
    src_address: src,
    dst_address: dst,
    src_port: sport,
    dst_port: dport,
    any_port: anyport,
    in_interface: iniface,
    out_interface: outiface,
    in_interface_list: inifacelist,
    out_interface_list: outifacelist,
    packet_mark: pktmark,
    connection_mark: connmark,
    routing_mark: routingmark,
    connection_type: conntype,
    connection_state: states,
    connection_nat_state: natStates,
    src_address_list: srclist,
    dst_address_list: dstlist,
    src_geoip: srcgeo,
    dst_geoip: dstgeo,
    comment,
    disabled: !enabled,

    // Advanced tab
    content: getFwFieldVal('content', false),
    src_mac_address: chainLower === 'output' ? '' : getFwFieldVal('srcmac', true),
    out_bridge_port: chainLower === 'input' ? '' : getFwFieldVal('outbridgeport', false),
    in_bridge_port: chainLower === 'output' ? '' : getFwFieldVal('inbridgeport', false),
    ipsec_policy: getFwFieldVal('ipsec', false),
    dscp: getFwFieldVal('dscp', false),
    tcp_mss: getFwFieldVal('tcpmss', false),
    tos: document.getElementById('fw-val-tos')?.value || '',
    packet_size: getFwFieldVal('pktsize', false),
    random: getFwFieldVal('random', false),
    tcp_flags: getFwFieldVal('tcpflags', false),
    icmp_options: getFwFieldVal('icmpoptions', false),
    ttl: getFwFieldVal('ttl', false),

    days: selectedDays,

    // Extra tab
    time: getFwFieldVal('time', false),
    limit: getFwFieldVal('limit', false),

    // Action tab
    reject_with: action === 'reject' ? (document.getElementById('filter-modal-rejectwith')?.value || '') : '',
    jump_target: action === 'jump' ? (document.getElementById('filter-modal-jumptarget')?.value || '') : '',
    address_list: action.startsWith('add-') ? (document.getElementById('filter-modal-action-addrlist')?.value || '') : '',
    address_list_timeout: action.startsWith('add-') ? (document.getElementById('filter-modal-action-timeout')?.value || '') : '',
    log: document.getElementById('filter-modal-log')?.checked || false,
    log_prefix: getFwFieldVal('logprefix', false)
  };

  try {
    const res = await fetch(`${API_BASE}/firewall/filter`, {
      method: 'POST',
      headers: { 'Content-Type': 'application/json' },
      body: JSON.stringify(payload)
    });
    if (res.ok) {
      const data = await res.json();
      showToast('Filter Rule Saved', 'Rule applied successfully to firewall', 'success');
      loadFirewall(false);
      if (closeAfter) {
        closeFilterModal();
      } else {
        if (data.id) {
          document.getElementById('filter-modal-id').value = data.id;
          const badge = document.getElementById('fw-modal-badge');
          if (badge) badge.innerText = `#${data.id}`;
        }
      }
    } else {
      const err = await res.json();
      showToast('Error', err.message || 'Failed to save rule', 'error');
    }
  } catch (err) {
    showToast('Error', err.message, 'error');
  }
}

function submitSaveFilterRule(e) {
  if (e && e.preventDefault) e.preventDefault();
  return applyFilterRule(true);
}

function startFwStatPolling() {
  stopFwStatPolling();
  pollRuleStats();
  state.fwStatInterval = setInterval(pollRuleStats, 1000);
}

function stopFwStatPolling() {
  if (state.fwStatInterval) {
    clearInterval(state.fwStatInterval);
    state.fwStatInterval = null;
  }
}

async function pollRuleStats() {
  const id = document.getElementById('filter-modal-id')?.value;
  if (!id) {
    renderFwSparkline('fw-stat-rate-svg', state.fwStatRateHistory || new Array(30).fill(0), 'bps', 'fw-stat-legend-rate');
    renderFwSparkline('fw-stat-pktrate-svg', state.fwStatPktHistory || new Array(30).fill(0), 'p/s', 'fw-stat-legend-pktrate');
    return;
  }

  try {
    const res = await fetch(`${API_BASE}/firewall/filter`);
    if (!res.ok) return;
    const rules = await res.json();
    const r = rules.find(x => x.id === id);
    if (!r) return;

    const now = Date.now();
    const dt = Math.max(0.2, (now - (state.fwLastTimestamp || now)) / 1000);
    state.fwLastTimestamp = now;

    const curBytes = r.bytes || 0;
    const curPackets = r.packets || 0;

    const deltaBytes = Math.max(0, curBytes - (state.fwLastBytes ?? curBytes));
    const deltaPkts = Math.max(0, curPackets - (state.fwLastPackets ?? curPackets));

    state.fwLastBytes = curBytes;
    state.fwLastPackets = curPackets;

    const rateBps = Math.round((deltaBytes * 8) / dt);
    const ratePkt = Math.round(deltaPkts / dt);

    if (!state.fwStatRateHistory) state.fwStatRateHistory = new Array(30).fill(0);
    if (!state.fwStatPktHistory) state.fwStatPktHistory = new Array(30).fill(0);

    state.fwStatRateHistory.push(rateBps);
    if (state.fwStatRateHistory.length > 30) state.fwStatRateHistory.shift();

    state.fwStatPktHistory.push(ratePkt);
    if (state.fwStatPktHistory.length > 30) state.fwStatPktHistory.shift();

    const bEl = document.getElementById('fw-stat-bytes');
    const pEl = document.getElementById('fw-stat-packets');
    const rEl = document.getElementById('fw-stat-rate');
    const prEl = document.getElementById('fw-stat-pktrate');

    if (bEl) bEl.value = formatTraffic(curBytes).replace('/s', '');
    if (pEl) pEl.value = curPackets.toLocaleString();
    if (rEl) rEl.value = formatBps(rateBps);
    if (prEl) prEl.value = `${ratePkt.toLocaleString()} p/s`;

    renderFwSparkline('fw-stat-rate-svg', state.fwStatRateHistory, 'bps', 'fw-stat-legend-rate');
    renderFwSparkline('fw-stat-pktrate-svg', state.fwStatPktHistory, 'p/s', 'fw-stat-legend-pktrate');
  } catch (e) {
    console.error('Error polling rule stats', e);
  }
}

function formatBps(bps) {
  if (bps >= 1000000000) return (bps / 1000000000).toFixed(1) + ' Gbps';
  if (bps >= 1000000) return (bps / 1000000).toFixed(1) + ' Mbps';
  if (bps >= 1000) return (bps / 1000).toFixed(1) + ' kbps';
  return bps + ' bps';
}

function renderFwSparkline(svgId, dataArray, unit, legendId) {
  const svg = document.getElementById(svgId);
  if (!svg) return;

  const w = 500;
  const h = 100;
  const paddingRight = 45;
  const graphWidth = w - paddingRight;

  const maxVal = Math.max(5, ...dataArray);
  const currentVal = dataArray[dataArray.length - 1] || 0;

  const leg = document.getElementById(legendId);
  if (leg) {
    leg.innerText = unit === 'bps' ? formatBps(currentVal) : `${currentVal.toLocaleString()} p/s`;
  }

  let gridLines = '';
  for (let i = 0; i <= 5; i++) {
    const y = 8 + (i * (h - 18) / 5);
    const valAtLevel = Math.round(maxVal * (5 - i) / 5);
    const label = unit === 'bps' ? formatBps(valAtLevel) : `${valAtLevel} p/s`;
    gridLines += `
      <line x1="0" y1="${y.toFixed(1)}" x2="${graphWidth}" y2="${y.toFixed(1)}" stroke="#1e2c3e" stroke-width="1" />
      <text x="${w - 2}" y="${(y + 3).toFixed(1)}" fill="#64748b" font-size="9" font-family="monospace" text-anchor="end">${label}</text>
    `;
  }

  const step = graphWidth / (dataArray.length - 1);
  const points = dataArray.map((val, idx) => {
    const x = idx * step;
    const y = (h - 10) - (val / maxVal) * (h - 20);
    return `${x.toFixed(1)},${y.toFixed(1)}`;
  });

  const polylineStr = points.join(' ');
  const areaPath = `M 0,${h - 10} L ${polylineStr} L ${graphWidth},${h - 10} Z`;

  svg.innerHTML = `
    ${gridLines}
    <path d="${areaPath}" fill="rgba(14, 165, 233, 0.12)" />
    <polyline fill="none" stroke="#38bdf8" stroke-width="1.8" stroke-linejoin="round" points="${polylineStr}" />
    <circle cx="${graphWidth}" cy="${points[points.length - 1].split(',')[1]}" r="3" fill="#38bdf8" />
  `;
}

async function moveFilterRule(id, dir) {
  id = decodeURIComponent(id);
  try {
    const res = await fetch(`${API_BASE}/firewall/filter/${encodeURIComponent(id)}/move`, {
      method: 'POST',
      headers: { 'Content-Type': 'application/json' },
      body: JSON.stringify({ direction: dir })
    });
    if (!res.ok) throw new Error(await responseError(res));
    await loadFirewall(false);
  } catch (err) {
    showToast('Error', err.message, 'error');
  }
}

async function toggleFilterRuleState(id, disabled) {
  id = decodeURIComponent(id);
  try {
    const res = await fetch(`${API_BASE}/firewall/filter/${encodeURIComponent(id)}/state`, {
      method: 'POST',
      headers: { 'Content-Type': 'application/json' },
      body: JSON.stringify({ disabled })
    });
    if (!res.ok) throw new Error(await responseError(res));
    await loadFirewall(false);
  } catch (err) {
    showToast('Error', err.message, 'error');
  }
}

async function deleteFilterRule(id) {
  id = decodeURIComponent(id);
  if (!confirm('Are you sure you want to delete this filter rule?')) return;
  try {
    const res = await fetch(`${API_BASE}/firewall/filter/${encodeURIComponent(id)}`, { method: 'DELETE' });
    if (!res.ok) throw new Error(await responseError(res));
    {
      showToast('Deleted', 'Filter rule removed', 'success');
      loadFirewall(false);
    }
  } catch (err) {
    showToast('Error', err.message, 'error');
  }
}

// ----------------- NAT Rules -----------------
function renderNATRules() {
  const chainFilter = document.getElementById('nat-filter-chain')?.value || '';
  const tbody = document.getElementById('nat-table-body');
  const empty = document.getElementById('nat-empty');
  if (!tbody) return;
  tbody.innerHTML = '';

  const rules = (state.natRules || []).filter(r => !chainFilter || nativeNATChain(r.chain) === chainFilter);
  document.getElementById('nat-count-badge').innerText = `${rules.length} Rules`;

  if (rules.length === 0) {
    empty?.classList.remove('hidden');
    return;
  }
  empty?.classList.add('hidden');

  rules.forEach((raw, idx) => {
    const r = safeFirewallRow(raw);
    const tr = document.createElement('tr');
    tr.className = `hover:bg-slate-800/40 transition text-xs ${r.disabled ? 'opacity-50' : ''}`;
    
    let toTarget = '-';
    if (r.action === 'jump') {
      toTarget = `<span class="text-yellow-300 font-mono font-bold">&rarr; ${r.jump_target || '-'}</span>`;
    } else if (r.action.includes('address-list') || r.action.includes('address list')) {
      toTarget = `<span class="text-emerald-300 font-mono font-bold">&rarr; ${r.address_list || '-'}</span>`;
    } else if (r.action === 'redirect') {
      toTarget = `<span class="text-amber-300 font-mono font-bold">ports:${r.to_ports || 'all'}</span>`;
    } else if (r.action === 'masquerade') {
      toTarget = r.to_ports ? `<span class="text-amber-300 font-mono font-bold">ports:${r.to_ports}</span>` : `<span class="text-slate-500 font-mono">-</span>`;
    } else if (r.action === 'log') {
      toTarget = `<span class="text-slate-400 font-mono font-bold">${r.log_prefix || 'log'}</span>`;
    } else {
      const parts = [r.to_addresses, r.to_ports].filter(Boolean);
      toTarget = parts.length ? `<span class="text-amber-300 font-mono font-bold">${parts.join(':')}</span>` : '-';
    }
    const ifaces = [r.out_interface ? 'out:' + r.out_interface : r.out_interface_list ? 'out-list:' + r.out_interface_list : '', r.in_interface ? 'in:' + r.in_interface : r.in_interface_list ? 'in-list:' + r.in_interface_list : ''].filter(Boolean).join(' ');

    tr.innerHTML = `
      <td class="py-2.5 px-3 text-center text-slate-500 font-bold">${r.order || idx + 1}</td>
      <td class="py-2.5 px-3 text-center">${renderRuleFlag(r.disabled, !!r.comment)}</td>
      <td class="py-2.5 px-3 font-bold text-amber-400">${escapeHtml(nativeNATChain(raw.chain).toUpperCase())}</td>
      <td class="py-2.5 px-3 text-slate-300">${formatTarget(r.src_address, r.src_address_list, r.src_geoip)}</td>
      <td class="py-2.5 px-3 text-slate-300">${formatTarget(r.dst_address, r.dst_address_list, r.dst_geoip)}</td>
      <td class="py-2.5 px-3 text-cyan-400 uppercase">${r.protocol || 'all'}${r.dst_port ? ':' + r.dst_port : ''} <span class="text-[9px] text-slate-500">IPv${r.ip_version || 4}</span></td>
      <td class="py-2.5 px-3 text-emerald-400">${ifaces || '-'}</td>
      <td class="py-2.5 px-3">${renderActionBadge(r.action)}</td>
      <td class="py-2.5 px-3 font-mono text-xs">${toTarget}</td>
      <td class="py-2.5 px-3 text-[11px] text-slate-400">
        <span class="text-slate-300" id="nat-pkts-${r.id}">${(r.packets || 0).toLocaleString()}p</span> / 
        <span class="text-slate-500" id="nat-bytes-${r.id}">${formatTraffic(r.bytes || 0).replace('/s', '')}</span>
      </td>
      <td class="py-2.5 px-3 text-slate-400 italic truncate max-w-[120px]" title="${r.comment || ''}">${r.comment || '-'}</td>
      <td class="py-2.5 px-3 text-right space-x-1.5 font-sans whitespace-nowrap">
        <button onclick="moveNATRule('${r.id}', 'up')" class="text-xs text-slate-400 hover:text-white px-1">▲</button>
        <button onclick="moveNATRule('${r.id}', 'down')" class="text-xs text-slate-400 hover:text-white px-1">▼</button>
        <button onclick="toggleNATRuleState('${r.id}', ${!r.disabled})" class="text-xs ${r.disabled ? 'text-emerald-400' : 'text-slate-400'} hover:underline">${r.disabled ? 'Enable' : 'Disable'}</button>
        <button onclick="openEditNATModal('${r.id}')" class="text-xs text-slate-400 hover:text-white">Edit</button>
        <button onclick="deleteNATRule('${r.id}')" class="text-xs text-slate-500 hover:text-rose-400">Delete</button>
      </td>
    `;
    tbody.appendChild(tr);
  });
}

// ==================== FIREWALL NAT MODAL (DEBTIK WEBFIG / WINBOX V4) ====================

function switchNATRuleTab(tab) {
  if (!document.getElementById(`nat-pane-${tab}`)) tab = 'general';
  state.activeNATRuleTab = tab;
  document.querySelectorAll('.nat-rule-tab-btn').forEach(btn => {
    btn.classList.remove('bg-[#182638]', 'text-white', 'border-sky-400');
    btn.classList.add('text-slate-400', 'border-transparent');
  });
  const activeBtn = document.getElementById(`nat-tab-btn-${tab}`);
  if (activeBtn) {
    activeBtn.classList.remove('text-slate-400', 'border-transparent');
    activeBtn.classList.add('bg-[#182638]', 'text-white', 'border-sky-400');
  }
  document.querySelectorAll('.nat-rule-pane').forEach(p => p.classList.add('hidden'));
  const activePane = document.getElementById(`nat-pane-${tab}`);
  if (activePane) activePane.classList.remove('hidden');

  if (tab === 'statistics') {
    startNATStatPolling();
  } else {
    stopNATStatPolling();
  }
}

function toggleNATField(fieldKey, expand) {
  const plusBtn = document.getElementById(`nat-plus-${fieldKey}`);
  const fieldBox = document.getElementById(`nat-field-${fieldKey}`);
  if (!plusBtn || !fieldBox) return;

  if (expand) {
    plusBtn.classList.add('hidden');
    fieldBox.classList.remove('hidden');
    const valInput = document.getElementById(`nat-val-${fieldKey}`);
    if (valInput) valInput.focus();
  } else {
    fieldBox.classList.add('hidden');
    plusBtn.classList.remove('hidden');
    const valInput = document.getElementById(`nat-val-${fieldKey}`);
    if (valInput) {
      if (valInput.tagName === 'SELECT') {
        valInput.selectedIndex = 0;
      } else {
        valInput.value = '';
      }
    }
    const invInput = document.getElementById(`nat-inv-${fieldKey}`);
    if (invInput) invInput.checked = false;

    if (fieldKey === 'days') {
      ['sun', 'mon', 'tue', 'wed', 'thu', 'fri', 'sat'].forEach(d => {
        const el = document.getElementById(`nat-day-${d}`);
        if (el) el.checked = true;
      });
    }
  }
}

function setNATFieldVal(fieldKey, value, hasInvert = false) {
  if (fieldKey === 'ipsec' && typeof value === 'string') value = value.replace(':', ',');
  if (value !== undefined && value !== null && value !== '' && !(fieldKey === 'proto' && value === 'all')) {
    toggleNATField(fieldKey, true);
    let strVal = String(value);
    if (hasInvert) {
      const inv = strVal.startsWith('!');
      if (inv) strVal = strVal.slice(1);
      const invEl = document.getElementById(`nat-inv-${fieldKey}`);
      if (invEl) invEl.checked = inv;
      else if (inv) strVal = '!'+strVal;
    }
    const valEl = document.getElementById(`nat-val-${fieldKey}`);
    if (valEl) { if (valEl.tagName === 'SELECT' && !Array.from(valEl.options).some(o => o.value === strVal)) { const option=document.createElement('option'); option.value=strVal; option.textContent=strVal+' (saved)'; valEl.appendChild(option); } valEl.value = strVal; }
  } else {
    toggleNATField(fieldKey, false);
  }
}

function getNATFieldVal(fieldKey, hasInvert = false) {
  const fieldBox = document.getElementById(`nat-field-${fieldKey}`);
  if (!fieldBox || fieldBox.classList.contains('hidden')) return '';
  const valEl = document.getElementById(`nat-val-${fieldKey}`);
  let v = valEl ? valEl.value.trim() : '';
  if (!v) return '';
  if (hasInvert) {
    const invEl = document.getElementById(`nat-inv-${fieldKey}`);
    if (invEl && invEl.checked) {
      v = '!' + v.replace(/^!/, '');
    }
  }
  return v;
}

function toggleMaximizeNATModal() {
  const win = document.getElementById('nat-modal-window');
  if (!win) return;
  if (win.classList.contains('max-w-[720px]')) {
    win.classList.remove('max-w-[720px]', 'max-h-[92vh]');
    win.classList.add('max-w-[96vw]', 'h-[94vh]');
  } else {
    win.classList.remove('max-w-[96vw]', 'h-[94vh]');
    win.classList.add('max-w-[720px]', 'max-h-[92vh]');
  }
}

function syncNATChainFromSelect() {
  const sel = document.getElementById('nat-modal-chain-select');
  const customWrap = document.getElementById('nat-modal-custom-wrap');
  const customInput = document.getElementById('nat-modal-custom-input');
  const chainInput = document.getElementById('nat-modal-chain');
  if (!sel || !chainInput) return;

  if (sel.value === '__custom__') {
    if (customWrap) customWrap.classList.remove('hidden');
    if (customInput) {
      customInput.value = '';
      customInput.focus();
    }
    chainInput.value = '';
  } else {
    if (customWrap) customWrap.classList.add('hidden');
    chainInput.value = sel.value;

    const actEl = document.getElementById('nat-modal-action');
    if (actEl) {
      const curAct = actEl.value;
      if (sel.value === 'prerouting' && ['masquerade', 'src-nat'].includes(curAct)) {
        actEl.value = 'dst-nat';
      } else if (sel.value === 'postrouting' && ['dst-nat', 'redirect'].includes(curAct)) {
        actEl.value = 'masquerade';
      }
    }
  }
  handleNATChainChange();
}

function syncNATCustomChainInput() {
  const customInput = document.getElementById('nat-modal-custom-input');
  const chainInput = document.getElementById('nat-modal-chain');
  if (customInput && chainInput) {
    chainInput.value = customInput.value.trim();
  }
  handleNATChainChange();
}

function handleNATChainChange() {
  const chainInput = document.getElementById('nat-modal-chain');
  const rawChain = (chainInput?.value || 'postrouting').trim();
  const chain = nativeNATChain(rawChain).toLowerCase();

  const sel = document.getElementById('nat-modal-chain-select');
  if (sel && sel.value !== chain && sel.value !== '__custom__') {
    if (['postrouting', 'prerouting', 'output', 'input'].includes(chain)) {
      sel.value = chain;
    }
  }

  const hintEl = document.getElementById('nat-chain-hint');
  if (hintEl) {
    if (chain === 'prerouting') {
      hintEl.textContent = 'PREROUTING: destination NAT (DNAT / REDIRECT) before routing decision (In-Interface only).';
    } else if (chain === 'postrouting') {
      hintEl.textContent = 'POSTROUTING: source NAT (SNAT / MASQUERADE) after routing decision (Out-Interface only).';
    } else if (chain === 'output') {
      hintEl.textContent = 'OUTPUT: destination NAT for locally generated packets (Out-Interface only).';
    } else if (chain === 'input') {
      hintEl.textContent = 'INPUT: source NAT for packets destined to local sockets (In-Interface only).';
    } else {
      hintEl.textContent = `Custom chain "${rawChain}": user-defined NAT chain reached via JUMP.`;
    }
  }

  const rowIn = document.getElementById('nat-row-iniface');
  const rowInList = document.getElementById('nat-row-inifacelist');
  const rowOut = document.getElementById('nat-row-outiface');
  const rowOutList = document.getElementById('nat-row-outifacelist');
  const rowInBridge = document.getElementById('nat-row-inbridgeport');
  const rowOutBridge = document.getElementById('nat-row-outbridgeport');
  const rowSrcMac = document.getElementById('nat-row-srcmac');

  if (chain === 'prerouting' || chain === 'input') {
    if (rowIn) rowIn.classList.remove('hidden');
    if (rowInList) rowInList.classList.remove('hidden');
    if (rowOut) rowOut.classList.add('hidden');
    if (rowOutList) rowOutList.classList.add('hidden');
    if (rowInBridge) rowInBridge.classList.remove('hidden');
    if (rowOutBridge) rowOutBridge.classList.add('hidden');
    if (rowSrcMac) rowSrcMac.classList.remove('hidden');
  } else if (chain === 'postrouting' || chain === 'output') {
    if (rowIn) rowIn.classList.add('hidden');
    if (rowInList) rowInList.classList.add('hidden');
    if (rowOut) rowOut.classList.remove('hidden');
    if (rowOutList) rowOutList.classList.remove('hidden');
    if (rowInBridge) rowInBridge.classList.add('hidden');
    if (rowOutBridge) rowOutBridge.classList.remove('hidden');
    if (rowSrcMac) rowSrcMac.classList.add('hidden');
  } else {
    if (rowIn) rowIn.classList.remove('hidden');
    if (rowInList) rowInList.classList.remove('hidden');
    if (rowOut) rowOut.classList.remove('hidden');
    if (rowOutList) rowOutList.classList.remove('hidden');
    if (rowInBridge) rowInBridge.classList.remove('hidden');
    if (rowOutBridge) rowOutBridge.classList.remove('hidden');
    if (rowSrcMac) rowSrcMac.classList.remove('hidden');
  }

  checkNATActionChainCompatibility();
  toggleNATActionFields();
}

function checkNATActionChainCompatibility() {
  const rawChain = (document.getElementById('nat-modal-chain')?.value || 'postrouting').trim();
  const chain = nativeNATChain(rawChain).toLowerCase();
  const action = (document.getElementById('nat-modal-action')?.value || '').toLowerCase();
  const warnBox = document.getElementById('nat-action-incompatible-warn');
  const warnMsg = document.getElementById('nat-action-incompatible-msg');
  if (!warnBox || !warnMsg) return;

  let msg = '';
  if (['dst-nat', 'redirect'].includes(action)) {
    if (chain !== 'prerouting' && chain !== 'output') {
      msg = `${action === 'dst-nat' ? 'DNAT' : 'REDIRECT'} is only valid in PREROUTING or OUTPUT chains in iptables (current chain: ${chain.toUpperCase()}).`;
    }
  } else if (action === 'masquerade') {
    if (chain !== 'postrouting') {
      msg = `MASQUERADE is only valid in the POSTROUTING chain in iptables (current chain: ${chain.toUpperCase()}).`;
    }
  } else if (action === 'src-nat') {
    if (chain !== 'postrouting' && chain !== 'input') {
      msg = `SNAT is only valid in POSTROUTING or INPUT chains in iptables (current chain: ${chain.toUpperCase()}).`;
    }
  }

  if (msg) {
    warnMsg.textContent = msg;
    warnBox.classList.remove('hidden');
  } else {
    warnBox.classList.add('hidden');
  }
}

function toggleNATActionFields() {
  const act = document.getElementById('nat-modal-action')?.value || 'masquerade';
  const rowAddr = document.getElementById('nat-row-toaddr');
  const rowPort = document.getElementById('nat-row-toport');
  const jumpBox = document.getElementById('nat-action-jump-box');
  const addrBox = document.getElementById('nat-action-addrlist-box');

  // Hide all dynamic rows first
  if (rowAddr) rowAddr.classList.add('hidden');
  if (rowPort) rowPort.classList.add('hidden');
  if (jumpBox) jumpBox.classList.add('hidden');
  if (addrBox) addrBox.classList.add('hidden');

  if (['src-nat', 'dst-nat', 'netmap'].includes(act)) {
    if (rowAddr) rowAddr.classList.remove('hidden');
    if (rowPort && act !== 'netmap') rowPort.classList.remove('hidden');
  } else if (act === 'redirect' || act === 'masquerade') {
    if (rowPort) rowPort.classList.remove('hidden');
  } else if (act === 'jump') {
    if (jumpBox) jumpBox.classList.remove('hidden');
  } else if (act.includes('address-list') || act.includes('address list')) {
    if (addrBox) addrBox.classList.remove('hidden');
  }

  if (act === 'log') {
    const logEl = document.getElementById('nat-modal-log');
    if (logEl) logEl.checked = true;
    toggleNATField('logprefix', true);
  }
}

function handleNATActionChange() {
  toggleNATActionFields();
  checkNATActionChainCompatibility();
}

function toggleNATLogPrefix() {
  const isLog = document.getElementById('nat-modal-log')?.checked;
  toggleNATField('logprefix', !!isLog);
}

function openAddNATModal() {
  const tos = document.getElementById('nat-val-tos'); if (tos) tos.value = '';
  switchNATRuleTab('general');
  setFirewallDays('nat', '');
  const badge = document.getElementById('nat-modal-badge');
  if (badge) badge.innerText = 'New...';
  document.getElementById('nat-modal-id').value = '';
  document.getElementById('nat-modal-family').value = '4';
  document.getElementById('nat-modal-enabled').checked = true;
  document.getElementById('nat-modal-comment').value = '';
  document.getElementById('nat-modal-chain').value = 'postrouting';
  populateChainDropdown('nat', 'postrouting');
  handleNATChainChange();
  document.getElementById('nat-modal-action').value = 'masquerade';
  document.getElementById('nat-modal-toaddr').value = '';
  document.getElementById('nat-modal-toport').value = '';
  document.getElementById('nat-modal-log').checked = false;

  populateInterfaceSelect('nat-val-iniface');
  populateInterfaceSelect('nat-val-outiface');
  populateAddressListSelect('nat-val-srclist');
  populateAddressListSelect('nat-val-dstlist');
  populateGeoIPSelect('nat-val-srcgeo');
  populateGeoIPSelect('nat-val-dstgeo');

  const allFieldKeys = [
    'src', 'dst', 'srclist', 'dstlist', 'srcgeo', 'dstgeo', 'proto', 'sport', 'dport', 'anyport',
    'iniface', 'outiface', 'inifacelist', 'outifacelist', 'pktmark', 'connmark',
    'routingmark', 'conntype',
    'layer7', 'content', 'connbytes', 'connrate', 'pcc', 'srcmac',
    'outbridgeport', 'inbridgeport', 'inbridgeportlist', 'outbridgeportlist',
    'ipsec', 'ingresspriority', 'priority', 'dscp', 'tcpmss',
    'pktsize', 'random', 'icmpoptions', 'ipv4options', 'ttl',
    'time', 'days', 'limit', 'dstlimit', 'psd', 'logprefix'
  ];
  allFieldKeys.forEach(k => toggleNATField(k, false));

  resetNATCounterDisplay();
  toggleNATActionFields();

  document.getElementById('nat-modal').classList.remove('hidden');
}

function openEditNATModal(id) {
  id = decodeURIComponent(id);
  const r = (state.natRules || []).find(rule => rule.id === id);
  if (!r) return;

  setFirewallDays('nat', r.days || '');
  switchNATRuleTab('general');
  const badge = document.getElementById('nat-modal-badge');
  if (badge) badge.innerText = `#${r.order != null ? r.order : r.id}`;

  document.getElementById('nat-modal-id').value = r.id;
  document.getElementById('nat-modal-family').value = String(r.ip_version || 4);
  document.getElementById('nat-modal-enabled').checked = !r.disabled;
  document.getElementById('nat-modal-comment').value = r.comment || '';
  const natChain = nativeNATChain(r.chain || 'postrouting');
  document.getElementById('nat-modal-chain').value = natChain;
  populateChainDropdown('nat', natChain);
  handleNATChainChange();
  setFirewallActionSelection('nat', r.action || 'accept');
  document.getElementById('nat-modal-toaddr').value = r.to_addresses || '';
  document.getElementById('nat-modal-toport').value = r.to_ports || '';
  document.getElementById('nat-modal-log').checked = !!r.log;

  populateInterfaceSelect('nat-val-iniface', (r.in_interface || '').replace(/^!/, ''));
  populateInterfaceSelect('nat-val-outiface', (r.out_interface || '').replace(/^!/, ''));
  populateAddressListSelect('nat-val-srclist', (r.src_address_list || '').replace(/^!/, ''));
  populateAddressListSelect('nat-val-dstlist', (r.dst_address_list || '').replace(/^!/, ''));
  populateGeoIPSelect('nat-val-srcgeo', r.src_geoip || '');
  populateGeoIPSelect('nat-val-dstgeo', r.dst_geoip || '');

  setNATFieldVal('src', r.src_address, true);
  setNATFieldVal('dst', r.dst_address, true);
  setNATFieldVal('srclist', r.src_address_list, true);
  setNATFieldVal('dstlist', r.dst_address_list, true);
  setNATFieldVal('srcgeo', r.src_geoip, true);
  setNATFieldVal('dstgeo', r.dst_geoip, true);
  if (r.protocol && r.protocol !== 'all') {
    setNATFieldVal('proto', r.protocol, true);
  } else {
    toggleNATField('proto', false);
  }
  setNATFieldVal('sport', r.src_port, true);
  setNATFieldVal('dport', r.dst_port, true);
  setNATFieldVal('anyport', r.any_port, true);
  setNATFieldVal('iniface', r.in_interface, true);
  setNATFieldVal('outiface', r.out_interface, true);
  setNATFieldVal('inifacelist', r.in_interface_list, true);
  setNATFieldVal('outifacelist', r.out_interface_list, true);
  setNATFieldVal('pktmark', r.packet_mark, true);
  setNATFieldVal('connmark', r.connection_mark, true);
  setNATFieldVal('routingmark', r.routing_mark, true);
  setNATFieldVal('conntype', r.connection_type, false);

  // Advanced tab fields
  setNATFieldVal('layer7', r.layer7_protocol, false);
  setNATFieldVal('content', r.content, false);
  setNATFieldVal('connbytes', r.connection_bytes, false);
  setNATFieldVal('connrate', r.connection_rate, false);
  setNATFieldVal('pcc', r.pcc, false);
  setNATFieldVal('srcmac', r.src_mac_address, true);
  setNATFieldVal('outbridgeport', r.out_bridge_port, false);
  setNATFieldVal('inbridgeport', r.in_bridge_port, false);
  setNATFieldVal('inbridgeportlist', r.in_bridge_port_list, false);
  setNATFieldVal('outbridgeportlist', r.out_bridge_port_list, false);
  setNATFieldVal('ipsec', r.ipsec_policy, false);
  setNATFieldVal('ingresspriority', r.ingress_priority, false);
  setNATFieldVal('priority', r.priority, false);
  setNATFieldVal('dscp', r.dscp, false);
  setNATFieldVal('tcpmss', r.tcp_mss, false);
  { const tosEl = document.getElementById('nat-val-tos'); if (tosEl) tosEl.value = r.tos || ''; }
  setNATFieldVal('pktsize', r.packet_size, false);
  setNATFieldVal('random', r.random, false);
  setNATFieldVal('icmpoptions', r.icmp_options, false);
  setNATFieldVal('ipv4options', r.ipv4_options, false);
  setNATFieldVal('ttl', r.ttl, false);

  // Extra tab fields
  setNATFieldVal('time', r.time, false);
  if (r.days) {
    toggleNATField('days', true);
    ['sun', 'mon', 'tue', 'wed', 'thu', 'fri', 'sat'].forEach(d => {
      const chk = document.getElementById(`nat-day-${d}`);
      if (chk) chk.checked = r.days.toLowerCase().includes(d);
    });
  } else {
    toggleNATField('days', false);
  }
  setNATFieldVal('limit', r.limit, false);
  setNATFieldVal('dstlimit', r.dst_limit, false);
  setNATFieldVal('psd', r.psd, false);

  // Action fields
  if (r.jump_target) {
    const jtEl = document.getElementById('nat-modal-jumptarget');
    if (jtEl) jtEl.value = r.jump_target;
  }
  if (r.address_list) {
    const alEl = document.getElementById('nat-modal-action-addrlist');
    if (alEl) alEl.value = r.address_list;
  }
  if (r.address_list_timeout) {
    const toEl = document.getElementById('nat-modal-action-timeout');
    if (toEl) toEl.value = r.address_list_timeout;
  }
  setNATFieldVal('logprefix', r.log_prefix, false);

  // Statistics
  const bEl = document.getElementById('nat-stat-bytes');
  const pEl = document.getElementById('nat-stat-packets');
  if (bEl) bEl.value = formatTraffic(r.bytes || 0).replace('/s', '');
  if (pEl) pEl.value = (r.packets || 0).toLocaleString();
  state.natLastBytes = r.bytes || 0;
  state.natLastPackets = r.packets || 0;
  state.natLastTimestamp = Date.now();
  state.natStatRateHistory = new Array(30).fill(0);
  state.natStatPktHistory = new Array(30).fill(0);
  renderFwSparkline('nat-stat-rate-svg', state.natStatRateHistory, 'bps', 'nat-stat-legend-rate');
  renderFwSparkline('nat-stat-pktrate-svg', state.natStatPktHistory, 'p/s', 'nat-stat-legend-pktrate');

  toggleNATActionFields();
  document.getElementById('nat-modal').classList.remove('hidden');
}

function closeNATModal() {
  stopNATStatPolling();
  document.getElementById('nat-modal').classList.add('hidden');
}

function copyNATRule() {
  document.getElementById('nat-modal-id').value = '';
  const badge = document.getElementById('nat-modal-badge');
  if (badge) badge.innerText = 'New...';
  showToast('Rule Cloned', 'Ready to save as a new NAT rule copy', 'info');
}

function resetNATCounterDisplay() {
  state.natStatRateHistory = new Array(30).fill(0);
  state.natStatPktHistory = new Array(30).fill(0);
  state.natLastBytes = 0;
  state.natLastPackets = 0;
  state.natLastTimestamp = Date.now();
  const bEl = document.getElementById('nat-stat-bytes');
  const pEl = document.getElementById('nat-stat-packets');
  const rEl = document.getElementById('nat-stat-rate');
  const prEl = document.getElementById('nat-stat-pktrate');
  if (bEl) bEl.value = '0 B';
  if (pEl) pEl.value = '0';
  if (rEl) rEl.value = '0 bps';
  if (prEl) prEl.value = '0 p/s';
  renderFwSparkline('nat-stat-rate-svg', state.natStatRateHistory, 'bps', 'nat-stat-legend-rate');
  renderFwSparkline('nat-stat-pktrate-svg', state.natStatPktHistory, 'p/s', 'nat-stat-legend-pktrate');
  showToast('Counters Reset', 'NAT rule counter display reset to 0', 'info');
}

async function applyNATRule(closeAfter = false) {
  const id = document.getElementById('nat-modal-id').value;
  if (!reviewLegacyFirewallSettings('nat', id)) return;
  let selectedDays; try { selectedDays = getFirewallDays('nat'); } catch(error) { showToast('Error', error.message, 'error'); return; }
  const chain = (document.getElementById('nat-modal-chain').value || '').trim();
  const chainLower = nativeNATChain(chain).toLowerCase();
  const action = document.getElementById('nat-modal-action').value;
  const comment = document.getElementById('nat-modal-comment').value.trim();
  const enabled = document.getElementById('nat-modal-enabled').checked;

  const src = getNATFieldVal('src', true);
  const dst = getNATFieldVal('dst', true);
  const srclist = getNATFieldVal('srclist', true);
  const dstlist = getNATFieldVal('dstlist', true);
  const srcgeo = getNATFieldVal('srcgeo', true);
  const dstgeo = getNATFieldVal('dstgeo', true);
  const proto = getNATFieldVal('proto', true);
  const sport = getNATFieldVal('sport', true);
  const dport = getNATFieldVal('dport', true);
  const anyport = getNATFieldVal('anyport', true);
  let iniface = getNATFieldVal('iniface', true);
  let outiface = getNATFieldVal('outiface', true);
  let inifacelist = getNATFieldVal('inifacelist', true);
  let outifacelist = getNATFieldVal('outifacelist', true);

  if (chainLower === 'prerouting' || chainLower === 'input') {
    outiface = '';
    outifacelist = '';
  } else if (chainLower === 'postrouting' || chainLower === 'output') {
    iniface = '';
    inifacelist = '';
  }

  const pktmark = getNATFieldVal('pktmark', true);
  const connmark = getNATFieldVal('connmark', true);
  const routingmark = getNATFieldVal('routingmark', true);
  const conntype = getNATFieldVal('conntype', false);

  const usesAddr = ['src-nat', 'dst-nat', 'netmap'].includes(action);
  const usesPort = ['src-nat', 'dst-nat', 'redirect', 'masquerade'].includes(action);
  if (!chain) { switchNATRuleTab('general'); showToast('NAT rule', 'Enter a chain.', 'error'); document.getElementById('nat-modal-chain').focus(); return; }
  if (chainLower === 'forward') { switchNATRuleTab('general'); showToast('Invalid Chain', 'Chain FORWARD is not valid in the NAT table in iptables.', 'error'); return; }
  if (['dst-nat', 'redirect'].includes(action) && chainLower !== 'prerouting' && chainLower !== 'output') {
    switchNATRuleTab('general');
    showToast('Invalid Target for Chain', `${action === 'dst-nat' ? 'DNAT' : 'REDIRECT'} requires PREROUTING or OUTPUT chain in iptables.`, 'error');
    return;
  }
  if (action === 'masquerade' && chainLower !== 'postrouting') {
    switchNATRuleTab('general');
    showToast('Invalid Target for Chain', 'MASQUERADE requires POSTROUTING chain in iptables.', 'error');
    return;
  }
  if (action === 'src-nat' && chainLower !== 'postrouting' && chainLower !== 'input') {
    switchNATRuleTab('general');
    showToast('Invalid Target for Chain', 'SNAT requires POSTROUTING or INPUT chain in iptables.', 'error');
    return;
  }
  if (usesAddr && !document.getElementById('nat-modal-toaddr').value.trim()) { switchNATRuleTab('general'); showToast('NAT rule', 'Enter the destination IP / address for this action.', 'error'); document.getElementById('nat-modal-toaddr').focus(); return; }
  if ((sport || dport || anyport || (usesPort && document.getElementById('nat-modal-toport').value.trim())) && !['tcp', 'udp'].includes(proto)) {
    switchNATRuleTab('general'); toggleNATField('proto', true); document.getElementById('nat-val-proto').value = proto || 'all';
    showToast('Select protocol', 'Port rules require TCP or UDP. For DNS, create one UDP and one TCP rule.', 'error'); document.getElementById('nat-val-proto').focus(); return;
  }


  const payload = {
    ip_version: Number(document.getElementById('nat-modal-family').value),
    id,
    chain,
    action,
    to_addresses: usesAddr ? (document.getElementById('nat-modal-toaddr')?.value.trim() || '') : '',
    to_ports: usesPort ? (document.getElementById('nat-modal-toport')?.value.trim() || '') : '',
    protocol: proto || 'all',
    src_address: src,
    dst_address: dst,
    src_port: sport,
    dst_port: dport,
    any_port: anyport,
    in_interface: iniface,
    out_interface: outiface,
    in_interface_list: inifacelist,
    out_interface_list: outifacelist,
    packet_mark: pktmark,
    connection_mark: connmark,
    routing_mark: routingmark,
    connection_type: conntype,
    src_address_list: srclist,
    dst_address_list: dstlist,
    src_geoip: srcgeo,
    dst_geoip: dstgeo,
    comment,
    disabled: !enabled,

    // Advanced tab
    content: getNATFieldVal('content', false),
    src_mac_address: (chainLower === 'output' || chainLower === 'postrouting') ? '' : getNATFieldVal('srcmac', true),
    out_bridge_port: (chainLower === 'input' || chainLower === 'prerouting') ? '' : getNATFieldVal('outbridgeport', false),
    in_bridge_port: (chainLower === 'output' || chainLower === 'postrouting') ? '' : getNATFieldVal('inbridgeport', false),
    ipsec_policy: getNATFieldVal('ipsec', false),
    dscp: getNATFieldVal('dscp', false),
    tcp_mss: getNATFieldVal('tcpmss', false),
    tos: document.getElementById('nat-val-tos')?.value || '',
    packet_size: getNATFieldVal('pktsize', false),
    random: getNATFieldVal('random', false),
    icmp_options: getNATFieldVal('icmpoptions', false),
    ttl: getNATFieldVal('ttl', false),

    days: selectedDays,

    // Extra tab
    time: getNATFieldVal('time', false),
    limit: getNATFieldVal('limit', false),

    // Action tab
    jump_target: action === 'jump' ? (document.getElementById('nat-modal-jumptarget')?.value || '') : '',
    address_list: action.includes('address') ? (document.getElementById('nat-modal-action-addrlist')?.value || '') : '',
    address_list_timeout: action.includes('address') ? (document.getElementById('nat-modal-action-timeout')?.value || '') : '',
    log: document.getElementById('nat-modal-log')?.checked || false,
    log_prefix: getNATFieldVal('logprefix', false)
  };

  try {
    const res = await fetch(`${API_BASE}/firewall/nat`, {
      method: 'POST',
      headers: { 'Content-Type': 'application/json' },
      body: JSON.stringify(payload)
    });
    if (res.ok) {
      const data = await res.json();
      showToast('NAT Rule Saved', 'NAT mapping updated', 'success');
      loadFirewall(false);
      if (closeAfter) {
        closeNATModal();
      } else {
        if (data.id) {
          document.getElementById('nat-modal-id').value = data.id;
          const badge = document.getElementById('nat-modal-badge');
          if (badge) badge.innerText = `#${data.id}`;
        }
      }
    } else {
      const err = await res.json();
      showToast('Error', err.message || 'Failed to save rule', 'error');
    }
  } catch (err) {
    showToast('Error', err.message, 'error');
  }
}

function submitSaveNATRule(e) {
  if (e && e.preventDefault) e.preventDefault();
  return applyNATRule(true);
}

function startNATStatPolling() {
  stopNATStatPolling();
  pollNATRuleStats();
  state.natStatInterval = setInterval(pollNATRuleStats, 1000);
}

function stopNATStatPolling() {
  if (state.natStatInterval) {
    clearInterval(state.natStatInterval);
    state.natStatInterval = null;
  }
}

async function pollNATRuleStats() {
  const id = document.getElementById('nat-modal-id')?.value;
  if (!id) {
    renderFwSparkline('nat-stat-rate-svg', state.natStatRateHistory || new Array(30).fill(0), 'bps', 'nat-stat-legend-rate');
    renderFwSparkline('nat-stat-pktrate-svg', state.natStatPktHistory || new Array(30).fill(0), 'p/s', 'nat-stat-legend-pktrate');
    return;
  }

  try {
    const res = await fetch(`${API_BASE}/firewall/nat`);
    if (!res.ok) return;
    const rules = await res.json();
    const r = rules.find(x => x.id === id);
    if (!r) return;

    const now = Date.now();
    const dt = Math.max(0.2, (now - (state.natLastTimestamp || now)) / 1000);
    state.natLastTimestamp = now;

    const curBytes = r.bytes || 0;
    const curPackets = r.packets || 0;

    const deltaBytes = Math.max(0, curBytes - (state.natLastBytes ?? curBytes));
    const deltaPkts = Math.max(0, curPackets - (state.natLastPackets ?? curPackets));

    state.natLastBytes = curBytes;
    state.natLastPackets = curPackets;

    const rateBps = Math.round((deltaBytes * 8) / dt);
    const ratePkt = Math.round(deltaPkts / dt);

    if (!state.natStatRateHistory) state.natStatRateHistory = new Array(30).fill(0);
    if (!state.natStatPktHistory) state.natStatPktHistory = new Array(30).fill(0);

    state.natStatRateHistory.push(rateBps);
    if (state.natStatRateHistory.length > 30) state.natStatRateHistory.shift();

    state.natStatPktHistory.push(ratePkt);
    if (state.natStatPktHistory.length > 30) state.natStatPktHistory.shift();

    const bEl = document.getElementById('nat-stat-bytes');
    const pEl = document.getElementById('nat-stat-packets');
    const rEl = document.getElementById('nat-stat-rate');
    const prEl = document.getElementById('nat-stat-pktrate');

    if (bEl) bEl.value = formatTraffic(curBytes).replace('/s', '');
    if (pEl) pEl.value = curPackets.toLocaleString();
    if (rEl) rEl.value = formatBps(rateBps);
    if (prEl) prEl.value = `${ratePkt.toLocaleString()} p/s`;

    renderFwSparkline('nat-stat-rate-svg', state.natStatRateHistory, 'bps', 'nat-stat-legend-rate');
    renderFwSparkline('nat-stat-pktrate-svg', state.natStatPktHistory, 'p/s', 'nat-stat-legend-pktrate');
  } catch (e) {
    console.error('Error polling NAT rule stats', e);
  }
}

async function moveNATRule(id, dir) {
  id = decodeURIComponent(id);
  try {
    const res = await fetch(`${API_BASE}/firewall/nat/${encodeURIComponent(id)}/move`, {
      method: 'POST',
      headers: { 'Content-Type': 'application/json' },
      body: JSON.stringify({ direction: dir })
    });
    if (!res.ok) throw new Error(await responseError(res));
    await loadFirewall(false);
  } catch (err) {
    showToast('Error', err.message, 'error');
  }
}

async function toggleNATRuleState(id, disabled) {
  id = decodeURIComponent(id);
  try {
    const res = await fetch(`${API_BASE}/firewall/nat/${encodeURIComponent(id)}/state`, {
      method: 'POST',
      headers: { 'Content-Type': 'application/json' },
      body: JSON.stringify({ disabled })
    });
    if (!res.ok) throw new Error(await responseError(res));
    await loadFirewall(false);
  } catch (err) {
    showToast('Error', err.message, 'error');
  }
}

async function deleteNATRule(id) {
  id = decodeURIComponent(id);
  if (!confirm('Are you sure you want to delete this NAT rule?')) return;
  try {
    const res = await fetch(`${API_BASE}/firewall/nat/${encodeURIComponent(id)}`, { method: 'DELETE' });
    if (!res.ok) throw new Error(await responseError(res));
    {
      showToast('Deleted', 'NAT rule removed', 'success');
      loadFirewall(false);
    }
  } catch (err) {
    showToast('Error', err.message, 'error');
  }
}

// ----------------- Mangle Rules -----------------
function renderMangleRules() {
  const chainFilter = document.getElementById('mangle-filter-chain')?.value || '';
  const tbody = document.getElementById('mangle-table-body');
  const empty = document.getElementById('mangle-empty');
  if (!tbody) return;
  tbody.innerHTML = '';

  const rules = (state.mangleRules || []).filter(r => !chainFilter || (r.chain || '').toLowerCase() === chainFilter);
  document.getElementById('mangle-count-badge').innerText = `${rules.length} Rules`;

  if (rules.length === 0) {
    empty?.classList.remove('hidden');
    return;
  }
  empty?.classList.add('hidden');

  rules.forEach((raw, idx) => {
    const r = safeFirewallRow(raw);
    const tr = document.createElement('tr');
    tr.className = `hover:bg-slate-800/40 transition text-xs ${r.disabled ? 'opacity-50' : ''}`;
    let markVal = '<span class="text-slate-500">-</span>';
    if (r.new_connection_mark) markVal = `<span class="text-cyan-300 font-mono font-bold">${r.new_connection_mark}</span>`;
    else if (r.new_routing_mark) markVal = `<span class="text-amber-300 font-mono font-bold">${r.new_routing_mark}</span>`;
    else if (r.new_packet_mark) markVal = `<span class="text-emerald-300 font-mono font-bold">${r.new_packet_mark}</span>`;
    else if (r.new_mss) markVal = `<span class="text-sky-300 font-mono font-bold">mss:${r.new_mss}</span>`;
    else if (r.action === 'change-dscp') markVal = `<span class="text-purple-300 font-mono font-bold">dscp:${r.new_dscp}</span>`;
    else if (r.new_ttl) markVal = `<span class="text-blue-300 font-mono font-bold">ttl:${r.new_ttl}</span>`;
    else if (r.new_priority) markVal = `<span class="text-indigo-300 font-mono font-bold">prio:${r.new_priority}</span>`;
    else if (r.route) markVal = `<span class="text-orange-300 font-mono font-bold">route:${r.route}</span>`;
    else if (r.sniff_target) markVal = `<span class="text-pink-300 font-mono font-bold">sniff:${r.sniff_target}</span>`;
    else if (r.action === 'jump') markVal = `<span class="text-yellow-300 font-mono font-bold">&rarr; ${r.jump_target || '-'}</span>`;
    else if (r.action.includes('address-list') || r.action.includes('address list')) markVal = `<span class="text-emerald-300 font-mono font-bold">&rarr; ${r.address_list || '-'}</span>`;
    else if (r.action === 'log') markVal = `<span class="text-slate-400 font-mono font-bold">${r.log_prefix || 'log'}</span>`;

    tr.innerHTML = `
      <td class="py-2.5 px-3 text-center text-slate-500 font-bold">${r.order || idx + 1}</td>
      <td class="py-2.5 px-3 text-center">${renderRuleFlag(r.disabled, !!r.comment)}</td>
      <td class="py-2.5 px-3 font-bold text-purple-400">${(r.chain || '').toUpperCase()}</td>
      <td class="py-2.5 px-3 text-slate-300">${formatTarget(r.src_address, r.src_address_list, r.src_geoip)}</td>
      <td class="py-2.5 px-3 text-slate-300">${formatTarget(r.dst_address, r.dst_address_list, r.dst_geoip)}</td>
      <td class="py-2.5 px-3">${renderActionBadge(r.action)}</td>
      <td class="py-2.5 px-3 font-mono text-xs">${markVal}</td>
      <td class="py-2.5 px-3 text-center">${r.passthrough ? '<span class="text-emerald-400">yes</span>' : '<span class="text-slate-500">no</span>'}</td>
      <td class="py-2.5 px-3 text-[11px] text-slate-400">
        <span class="text-slate-300" id="mangle-pkts-${r.id}">${(r.packets || 0).toLocaleString()}p</span> / 
        <span class="text-slate-500" id="mangle-bytes-${r.id}">${formatTraffic(r.bytes || 0).replace('/s', '')}</span>
      </td>
      <td class="py-2.5 px-3 text-slate-400 italic truncate max-w-[120px]" title="${r.comment || ''}">${r.comment || '-'}</td>
      <td class="py-2.5 px-3 text-right space-x-1.5 font-sans whitespace-nowrap">
        <button onclick="moveMangleRule('${r.id}', 'up')" class="text-xs text-slate-400 hover:text-white px-1">▲</button>
        <button onclick="moveMangleRule('${r.id}', 'down')" class="text-xs text-slate-400 hover:text-white px-1">▼</button>
        <button onclick="toggleMangleRuleState('${r.id}', ${!r.disabled})" class="text-xs ${r.disabled ? 'text-emerald-400' : 'text-slate-400'} hover:underline">${r.disabled ? 'Enable' : 'Disable'}</button>
        <button onclick="openEditMangleModal('${r.id}')" class="text-xs text-slate-400 hover:text-white">Edit</button>
        <button onclick="deleteMangleRule('${r.id}')" class="text-xs text-slate-500 hover:text-rose-400">Delete</button>
      </td>
    `;
    tbody.appendChild(tr);
  });
}

// ==================== FIREWALL MANGLE MODAL (DEBTIK WEBFIG / WINBOX V4) ====================

function switchMangleRuleTab(tab) {
  state.activeMangleRuleTab = tab;
  document.querySelectorAll('.mangle-rule-tab-btn').forEach(btn => {
    btn.classList.remove('bg-[#182638]', 'text-white', 'border-sky-400');
    btn.classList.add('text-slate-400', 'border-transparent');
  });
  const activeBtn = document.getElementById(`mangle-tab-btn-${tab}`);
  if (activeBtn) {
    activeBtn.classList.remove('text-slate-400', 'border-transparent');
    activeBtn.classList.add('bg-[#182638]', 'text-white', 'border-sky-400');
  }
  document.querySelectorAll('.mangle-rule-pane').forEach(p => p.classList.add('hidden'));
  const activePane = document.getElementById(`mangle-pane-${tab}`);
  if (activePane) activePane.classList.remove('hidden');

  if (tab === 'statistics') {
    startMangleStatPolling();
  } else {
    stopMangleStatPolling();
  }
}

function toggleMangleField(fieldKey, expand) {
  const plusBtn = document.getElementById(`mangle-plus-${fieldKey}`);
  const fieldBox = document.getElementById(`mangle-field-${fieldKey}`);
  if (!plusBtn || !fieldBox) return;

  if (expand) {
    plusBtn.classList.add('hidden');
    fieldBox.classList.remove('hidden');
    const valInput = document.getElementById(`mangle-val-${fieldKey}`);
    if (valInput) valInput.focus();
  } else {
    fieldBox.classList.add('hidden');
    plusBtn.classList.remove('hidden');
    const valInput = document.getElementById(`mangle-val-${fieldKey}`);
    if (valInput) {
      if (valInput.tagName === 'SELECT') {
        valInput.selectedIndex = 0;
      } else {
        valInput.value = '';
      }
    }
    const invInput = document.getElementById(`mangle-inv-${fieldKey}`);
    if (invInput) invInput.checked = false;

    if (fieldKey === 'cs') {
      ['mangle-modal-cs-established', 'mangle-modal-cs-related', 'mangle-modal-cs-new', 'mangle-modal-cs-invalid', 'mangle-modal-cs-untracked'].forEach(id => {
        const el = document.getElementById(id);
        if (el) el.checked = false;
      });
    }
    if (fieldKey === 'natstate') {
      ['mangle-modal-nat-srcnat', 'mangle-modal-nat-dstnat'].forEach(id => {
        const el = document.getElementById(id);
        if (el) el.checked = false;
      });
    }
  }
}

function setMangleFieldVal(fieldKey, value, hasInvert = false) {
  if (fieldKey === 'ipsec' && typeof value === 'string') value = value.replace(':', ',');
  if (value !== undefined && value !== null && value !== '' && !(fieldKey === 'proto' && value === 'all')) {
    toggleMangleField(fieldKey, true);
    let strVal = String(value);
    if (hasInvert) {
      const inv = strVal.startsWith('!');
      if (inv) strVal = strVal.slice(1);
      const invEl = document.getElementById(`mangle-inv-${fieldKey}`);
      if (invEl) invEl.checked = inv;
      else if (inv) strVal = '!'+strVal;
    }
    const valEl = document.getElementById(`mangle-val-${fieldKey}`);
    if (valEl) { if (valEl.tagName === 'SELECT' && !Array.from(valEl.options).some(o => o.value === strVal)) { const option=document.createElement('option'); option.value=strVal; option.textContent=strVal+' (saved)'; valEl.appendChild(option); } valEl.value = strVal; }
  } else {
    toggleMangleField(fieldKey, false);
  }
}

function getMangleFieldVal(fieldKey, hasInvert = false) {
  const fieldBox = document.getElementById(`mangle-field-${fieldKey}`);
  if (!fieldBox || fieldBox.classList.contains('hidden')) return '';
  const valEl = document.getElementById(`mangle-val-${fieldKey}`);
  let v = valEl ? valEl.value.trim() : '';
  if (!v) return '';
  if (hasInvert) {
    const invEl = document.getElementById(`mangle-inv-${fieldKey}`);
    if (invEl && invEl.checked) {
      v = '!' + v.replace(/^!/, '');
    }
  }
  return v;
}

function toggleMaximizeMangleModal() {
  const win = document.getElementById('mangle-modal-window');
  if (!win) return;
  if (win.classList.contains('max-w-[720px]')) {
    win.classList.remove('max-w-[720px]', 'max-h-[92vh]');
    win.classList.add('max-w-[96vw]', 'h-[94vh]');
  } else {
    win.classList.remove('max-w-[96vw]', 'h-[94vh]');
    win.classList.add('max-w-[720px]', 'max-h-[92vh]');
  }
}

function syncMangleChainFromSelect() {
  const sel = document.getElementById('mangle-modal-chain-select');
  const customWrap = document.getElementById('mangle-modal-custom-wrap');
  const customInput = document.getElementById('mangle-modal-custom-input');
  const chainInput = document.getElementById('mangle-modal-chain');
  if (!sel || !chainInput) return;

  if (sel.value === '__custom__') {
    if (customWrap) customWrap.classList.remove('hidden');
    if (customInput) {
      customInput.value = '';
      customInput.focus();
    }
    chainInput.value = '';
  } else {
    if (customWrap) customWrap.classList.add('hidden');
    chainInput.value = sel.value;
  }
  handleMangleChainChange();
}

function syncMangleCustomChainInput() {
  const customInput = document.getElementById('mangle-modal-custom-input');
  const chainInput = document.getElementById('mangle-modal-chain');
  if (customInput && chainInput) {
    chainInput.value = customInput.value.trim();
  }
  handleMangleChainChange();
}

function handleMangleChainChange() {
  const chainInput = document.getElementById('mangle-modal-chain');
  const rawChain = (chainInput?.value || 'prerouting').trim();
  const chain = rawChain.toLowerCase();

  const sel = document.getElementById('mangle-modal-chain-select');
  if (sel && sel.value !== chain && sel.value !== '__custom__') {
    if (['prerouting', 'input', 'forward', 'output', 'postrouting'].includes(chain)) {
      sel.value = chain;
    }
  }

  const hintEl = document.getElementById('mangle-chain-hint');
  if (hintEl) {
    if (chain === 'prerouting') {
      hintEl.textContent = 'PREROUTING: packets altered before routing decision (In-Interface only).';
    } else if (chain === 'input') {
      hintEl.textContent = 'INPUT: packets altered before local socket delivery (In-Interface only).';
    } else if (chain === 'forward') {
      hintEl.textContent = 'FORWARD: transit packets routed through this router (accepts both In and Out interfaces).';
    } else if (chain === 'output') {
      hintEl.textContent = 'OUTPUT: locally generated packets before routing decision (Out-Interface only).';
    } else if (chain === 'postrouting') {
      hintEl.textContent = 'POSTROUTING: packets altered after routing decision before transmission (Out-Interface only; CLASSIFY supported).';
    } else {
      hintEl.textContent = `Custom chain "${rawChain}": user-defined Mangle chain reached via JUMP.`;
    }
  }

  const rowIn = document.getElementById('mangle-row-iniface');
  const rowInList = document.getElementById('mangle-row-inifacelist');
  const rowOut = document.getElementById('mangle-row-outiface');
  const rowOutList = document.getElementById('mangle-row-outifacelist');
  const rowInBridge = document.getElementById('mangle-row-inbridgeport');
  const rowOutBridge = document.getElementById('mangle-row-outbridgeport');
  const rowSrcMac = document.getElementById('mangle-row-srcmac');

  if (chain === 'prerouting' || chain === 'input') {
    if (rowIn) rowIn.classList.remove('hidden');
    if (rowInList) rowInList.classList.remove('hidden');
    if (rowOut) rowOut.classList.add('hidden');
    if (rowOutList) rowOutList.classList.add('hidden');
    if (rowInBridge) rowInBridge.classList.remove('hidden');
    if (rowOutBridge) rowOutBridge.classList.add('hidden');
    if (rowSrcMac) rowSrcMac.classList.remove('hidden');
  } else if (chain === 'output' || chain === 'postrouting') {
    if (rowIn) rowIn.classList.add('hidden');
    if (rowInList) rowInList.classList.add('hidden');
    if (rowOut) rowOut.classList.remove('hidden');
    if (rowOutList) rowOutList.classList.remove('hidden');
    if (rowInBridge) rowInBridge.classList.add('hidden');
    if (rowOutBridge) rowOutBridge.classList.remove('hidden');
    if (rowSrcMac) rowSrcMac.classList.add('hidden');
  } else {
    if (rowIn) rowIn.classList.remove('hidden');
    if (rowInList) rowInList.classList.remove('hidden');
    if (rowOut) rowOut.classList.remove('hidden');
    if (rowOutList) rowOutList.classList.remove('hidden');
    if (rowInBridge) rowInBridge.classList.remove('hidden');
    if (rowOutBridge) rowOutBridge.classList.remove('hidden');
    if (rowSrcMac) rowSrcMac.classList.remove('hidden');
  }

  checkMangleActionChainCompatibility();
  toggleMangleActionFields();
}

function checkMangleActionChainCompatibility() {
  const rawChain = (document.getElementById('mangle-modal-chain')?.value || 'prerouting').trim();
  const chain = rawChain.toLowerCase();
  const action = (document.getElementById('mangle-modal-action')?.value || '').toLowerCase();
  const warnBox = document.getElementById('mangle-action-incompatible-warn');
  const warnMsg = document.getElementById('mangle-action-incompatible-msg');
  if (!warnBox || !warnMsg) return;

  let msg = '';
  if (action === 'set-priority' && chain !== 'postrouting') {
    msg = 'CLASSIFY (set-priority) requires the POSTROUTING chain in iptables.';
  }

  if (msg) {
    warnMsg.textContent = msg;
    warnBox.classList.remove('hidden');
  } else {
    warnBox.classList.add('hidden');
  }
}

function toggleMangleActionFields() {
  const act = document.getElementById('mangle-modal-action')?.value || 'mark-connection';
  
  // Hide all dynamic rows first
  ['newconnmark', 'newroutingmark', 'newpktmark', 'newmss', 'newdscp', 'newttl', 'newpriority', 'route', 'sniff', 'passthrough'].forEach(id => {
    const el = document.getElementById(`mangle-row-${id}`);
    if (el) el.classList.add('hidden');
  });
  const jumpBox = document.getElementById('mangle-action-jump-box');
  const addrBox = document.getElementById('mangle-action-addrlist-box');
  if (jumpBox) jumpBox.classList.add('hidden');
  if (addrBox) addrBox.classList.add('hidden');

  // Activate matching rows
  if (act === 'mark-connection') {
    document.getElementById('mangle-row-newconnmark')?.classList.remove('hidden');
    document.getElementById('mangle-row-passthrough')?.classList.remove('hidden');
  } else if (act === 'mark-routing') {
    document.getElementById('mangle-row-newroutingmark')?.classList.remove('hidden');
    document.getElementById('mangle-row-passthrough')?.classList.remove('hidden');
  } else if (act === 'mark-packet') {
    document.getElementById('mangle-row-newpktmark')?.classList.remove('hidden');
    document.getElementById('mangle-row-passthrough')?.classList.remove('hidden');
  } else if (act === 'change-mss') {
    document.getElementById('mangle-row-newmss')?.classList.remove('hidden');
    document.getElementById('mangle-row-passthrough')?.classList.remove('hidden');
  } else if (act === 'change-dscp') {
    document.getElementById('mangle-row-newdscp')?.classList.remove('hidden');
    document.getElementById('mangle-row-passthrough')?.classList.remove('hidden');
  } else if (act === 'change-ttl') {
    document.getElementById('mangle-row-newttl')?.classList.remove('hidden');
    document.getElementById('mangle-row-passthrough')?.classList.remove('hidden');
  } else if (act === 'set-priority') {
    document.getElementById('mangle-row-newpriority')?.classList.remove('hidden');
    document.getElementById('mangle-row-passthrough')?.classList.remove('hidden');
  } else if (act === 'route') {
    document.getElementById('mangle-row-route')?.classList.remove('hidden');
    document.getElementById('mangle-row-passthrough')?.classList.remove('hidden');
  } else if (act === 'sniff-pc' || act === 'sniff-tzsp') {
    document.getElementById('mangle-row-sniff')?.classList.remove('hidden');
    document.getElementById('mangle-row-passthrough')?.classList.remove('hidden');
  } else if (act === 'clear-df' || act === 'strip-ipv4-options') {
    document.getElementById('mangle-row-passthrough')?.classList.remove('hidden');
  } else if (act === 'jump') {
    if (jumpBox) jumpBox.classList.remove('hidden');
  } else if (act.includes('address-list') || act.includes('address list')) {
    if (addrBox) addrBox.classList.remove('hidden');
  }

  if (act === 'log') {
    const logEl = document.getElementById('mangle-modal-log');
    if (logEl) logEl.checked = true;
    toggleMangleField('logprefix', true);
  }
  checkMangleActionChainCompatibility();
}

function toggleMangleLogPrefix() {
  const isLog = document.getElementById('mangle-modal-log')?.checked;
  toggleMangleField('logprefix', !!isLog);
}

const allMangleFieldKeys = [
  'src', 'dst', 'srclist', 'dstlist', 'srcgeo', 'dstgeo', 'proto', 'sport', 'dport', 'anyport',
  'iniface', 'outiface', 'inifacelist', 'outifacelist', 'pktmark', 'connmark',
  'routingmark', 'conntype', 'cs', 'natstate',
  'layer7', 'content', 'connbytes', 'connrate', 'pcc', 'srcmac',
  'outbridgeport', 'inbridgeport', 'inbridgeportlist', 'outbridgeportlist',
  'ipsec', 'tlshost', 'ingresspriority', 'priority', 'dscp', 'tcpmss',
  'pktsize', 'random', 'tcpflags', 'icmpoptions', 'ipv4options', 'ttl',
  'nth', 'connlimit', 'srcaddrtype', 'dstaddrtype', 'hotspot', 'ipfragment',
  'limit', 'dstlimit', 'time', 'psd', 'logprefix'
];

function openAddMangleModal() {
  const tos = document.getElementById('mangle-val-tos'); if (tos) tos.value = '';
  switchMangleRuleTab('general');
  const badge = document.getElementById('mangle-modal-badge');
  if (badge) badge.innerText = 'New...';
  document.getElementById('mangle-modal-id').value = '';
  document.getElementById('mangle-modal-family').value = '4';
  document.getElementById('mangle-modal-enabled').checked = true;
  document.getElementById('mangle-modal-comment').value = '';
  document.getElementById('mangle-modal-chain').value = 'prerouting';
  populateChainDropdown('mangle', 'prerouting');
  handleMangleChainChange();
  document.getElementById('mangle-modal-action').value = 'mark-connection';
  
  if (document.getElementById('mangle-modal-newconnmark')) document.getElementById('mangle-modal-newconnmark').value = '';
  if (document.getElementById('mangle-modal-newroutingmark')) document.getElementById('mangle-modal-newroutingmark').value = '';
  if (document.getElementById('mangle-modal-newpktmark')) document.getElementById('mangle-modal-newpktmark').value = '';
  if (document.getElementById('mangle-modal-newmss')) document.getElementById('mangle-modal-newmss').value = '';
  if (document.getElementById('mangle-modal-newdscp')) document.getElementById('mangle-modal-newdscp').value = '';
  if (document.getElementById('mangle-modal-newttl')) document.getElementById('mangle-modal-newttl').value = '';
  if (document.getElementById('mangle-modal-newpriority')) document.getElementById('mangle-modal-newpriority').value = '';
  if (document.getElementById('mangle-modal-route')) document.getElementById('mangle-modal-route').value = '';
  if (document.getElementById('mangle-modal-sniff')) document.getElementById('mangle-modal-sniff').value = '';
  if (document.getElementById('mangle-modal-jumptarget')) document.getElementById('mangle-modal-jumptarget').value = '';
  if (document.getElementById('mangle-modal-action-addrlist')) document.getElementById('mangle-modal-action-addrlist').value = '';
  if (document.getElementById('mangle-modal-action-timeout')) document.getElementById('mangle-modal-action-timeout').value = '';
  if (document.getElementById('mangle-modal-passthrough')) document.getElementById('mangle-modal-passthrough').checked = true;
  if (document.getElementById('mangle-modal-log')) document.getElementById('mangle-modal-log').checked = false;

  populateInterfaceSelect('mangle-val-iniface');
  populateInterfaceSelect('mangle-val-outiface');
  populateAddressListSelect('mangle-val-srclist');
  populateAddressListSelect('mangle-val-dstlist');
  populateGeoIPSelect('mangle-val-srcgeo');
  populateGeoIPSelect('mangle-val-dstgeo');

  allMangleFieldKeys.forEach(k => toggleMangleField(k, false));

  resetMangleCounterDisplay();
  toggleMangleActionFields();

  document.getElementById('mangle-modal').classList.remove('hidden');
}

function openEditMangleModal(id) {
  id = decodeURIComponent(id);
  const r = (state.mangleRules || []).find(rule => rule.id === id);
  if (!r) return;

  switchMangleRuleTab('general');
  const badge = document.getElementById('mangle-modal-badge');
  if (badge) badge.innerText = `#${r.order != null ? r.order : r.id}`;

  document.getElementById('mangle-modal-id').value = r.id;
  document.getElementById('mangle-modal-family').value = String(r.ip_version || 4);
  document.getElementById('mangle-modal-enabled').checked = !r.disabled;
  document.getElementById('mangle-modal-comment').value = r.comment || '';
  const mangleChain = r.chain || 'prerouting';
  document.getElementById('mangle-modal-chain').value = mangleChain;
  populateChainDropdown('mangle', mangleChain);
  handleMangleChainChange();
  setFirewallActionSelection('mangle', r.action || 'accept');
  
  if (document.getElementById('mangle-modal-newconnmark')) document.getElementById('mangle-modal-newconnmark').value = r.new_connection_mark || '';
  if (document.getElementById('mangle-modal-newroutingmark')) document.getElementById('mangle-modal-newroutingmark').value = r.new_routing_mark || '';
  if (document.getElementById('mangle-modal-newpktmark')) document.getElementById('mangle-modal-newpktmark').value = r.new_packet_mark || '';
  if (document.getElementById('mangle-modal-newmss')) document.getElementById('mangle-modal-newmss').value = r.new_mss || '';
  if (document.getElementById('mangle-modal-newdscp')) document.getElementById('mangle-modal-newdscp').value = r.new_dscp != null ? r.new_dscp : '';
  if (document.getElementById('mangle-modal-newttl')) document.getElementById('mangle-modal-newttl').value = r.new_ttl || '';
  if (document.getElementById('mangle-modal-newpriority')) document.getElementById('mangle-modal-newpriority').value = r.new_priority || '';
  if (document.getElementById('mangle-modal-route')) document.getElementById('mangle-modal-route').value = r.route || '';
  if (document.getElementById('mangle-modal-sniff')) document.getElementById('mangle-modal-sniff').value = r.sniff_target || '';
  if (document.getElementById('mangle-modal-jumptarget')) document.getElementById('mangle-modal-jumptarget').value = r.jump_target || '';
  if (document.getElementById('mangle-modal-action-addrlist')) document.getElementById('mangle-modal-action-addrlist').value = r.address_list || '';
  if (document.getElementById('mangle-modal-action-timeout')) document.getElementById('mangle-modal-action-timeout').value = r.address_list_timeout || '';
  if (document.getElementById('mangle-modal-passthrough')) document.getElementById('mangle-modal-passthrough').checked = r.passthrough ?? true;
  if (document.getElementById('mangle-modal-log')) document.getElementById('mangle-modal-log').checked = !!r.log;

  populateInterfaceSelect('mangle-val-iniface', (r.in_interface || '').replace(/^!/, ''));
  populateInterfaceSelect('mangle-val-outiface', (r.out_interface || '').replace(/^!/, ''));
  populateAddressListSelect('mangle-val-srclist', (r.src_address_list || '').replace(/^!/, ''));
  populateAddressListSelect('mangle-val-dstlist', (r.dst_address_list || '').replace(/^!/, ''));
  populateGeoIPSelect('mangle-val-srcgeo', r.src_geoip || '');
  populateGeoIPSelect('mangle-val-dstgeo', r.dst_geoip || '');

  setMangleFieldVal('src', r.src_address, true);
  setMangleFieldVal('dst', r.dst_address, true);
  setMangleFieldVal('srclist', r.src_address_list, true);
  setMangleFieldVal('dstlist', r.dst_address_list, true);
  setMangleFieldVal('srcgeo', r.src_geoip, true);
  setMangleFieldVal('dstgeo', r.dst_geoip, true);
  if (r.protocol && r.protocol !== 'all') {
    setMangleFieldVal('proto', r.protocol, true);
  } else {
    toggleMangleField('proto', false);
  }
  setMangleFieldVal('sport', r.src_port, true);
  setMangleFieldVal('dport', r.dst_port, true);
  setMangleFieldVal('anyport', r.any_port, true);
  setMangleFieldVal('iniface', r.in_interface, true);
  setMangleFieldVal('outiface', r.out_interface, true);
  setMangleFieldVal('inifacelist', r.in_interface_list, true);
  setMangleFieldVal('outifacelist', r.out_interface_list, true);
  setMangleFieldVal('pktmark', r.packet_mark, true);
  setMangleFieldVal('connmark', r.connection_mark, true);
  setMangleFieldVal('routingmark', r.routing_mark, true);
  setMangleFieldVal('conntype', r.connection_type, false);

  // Connection State
  const states = r.connection_state || [];
  if (states.length > 0) {
    toggleMangleField('cs', true);
    ['established', 'related', 'new', 'invalid', 'untracked'].forEach(s => {
      const el = document.getElementById(`mangle-modal-cs-${s}`);
      if (el) el.checked = states.includes(s);
    });
  } else {
    toggleMangleField('cs', false);
  }

  // Connection NAT State
  const natStates = r.connection_nat_state || [];
  if (natStates.length > 0) {
    toggleMangleField('natstate', true);
    ['srcnat', 'dstnat'].forEach(s => {
      const el = document.getElementById(`mangle-modal-nat-${s}`);
      if (el) el.checked = natStates.includes(s);
    });
  } else {
    toggleMangleField('natstate', false);
  }

  // Advanced tab fields
  setMangleFieldVal('layer7', r.layer7_protocol, false);
  setMangleFieldVal('content', r.content, false);
  setMangleFieldVal('connbytes', r.connection_bytes, false);
  setMangleFieldVal('connrate', r.connection_rate, false);
  setMangleFieldVal('pcc', r.pcc, false);
  setMangleFieldVal('srcmac', r.src_mac_address, true);
  setMangleFieldVal('outbridgeport', r.out_bridge_port, false);
  setMangleFieldVal('inbridgeport', r.in_bridge_port, false);
  setMangleFieldVal('inbridgeportlist', r.in_bridge_port_list, false);
  setMangleFieldVal('outbridgeportlist', r.out_bridge_port_list, false);
  setMangleFieldVal('ipsec', r.ipsec_policy, false);
  setMangleFieldVal('tlshost', r.tls_host, false);
  setMangleFieldVal('ingresspriority', r.ingress_priority, false);
  setMangleFieldVal('priority', r.priority, false);
  setMangleFieldVal('dscp', r.dscp, false);
  setMangleFieldVal('tcpmss', r.tcp_mss, false);
  { const tosEl = document.getElementById('mangle-val-tos'); if (tosEl) tosEl.value = r.tos || ''; }
  setMangleFieldVal('pktsize', r.packet_size, false);
  setMangleFieldVal('random', r.random, false);
  setMangleFieldVal('tcpflags', r.tcp_flags, false);
  setMangleFieldVal('icmpoptions', r.icmp_options, false);
  setMangleFieldVal('ipv4options', r.ipv4_options, false);
  setMangleFieldVal('ttl', r.ttl, false);

  // Extra tab fields
  setMangleFieldVal('nth', r.nth, false);
  setMangleFieldVal('connlimit', r.connection_limit, false);
  setMangleFieldVal('srcaddrtype', r.src_address_type, false);
  setMangleFieldVal('dstaddrtype', r.dst_address_type, false);
  setMangleFieldVal('hotspot', r.hotspot, false);
  setMangleFieldVal('ipfragment', r.ip_fragment, false);
  setMangleFieldVal('limit', r.limit, false);
  setMangleFieldVal('dstlimit', r.dst_limit, false);
  setMangleFieldVal('time', r.time, false);
  setMangleFieldVal('psd', r.psd, false);

  // Action fields
  if (r.jump_target) {
    const jtEl = document.getElementById('mangle-modal-jumptarget');
    if (jtEl) jtEl.value = r.jump_target;
  }
  if (r.address_list) {
    const alEl = document.getElementById('mangle-modal-action-addrlist');
    if (alEl) alEl.value = r.address_list;
  }
  if (r.address_list_timeout) {
    const toEl = document.getElementById('mangle-modal-action-timeout');
    if (toEl) toEl.value = r.address_list_timeout;
  }
  setMangleFieldVal('logprefix', r.log_prefix, false);

  // Statistics
  const bEl = document.getElementById('mangle-stat-bytes');
  const pEl = document.getElementById('mangle-stat-packets');
  if (bEl) bEl.value = formatTraffic(r.bytes || 0).replace('/s', '');
  if (pEl) pEl.value = (r.packets || 0).toLocaleString();
  state.mangleLastBytes = r.bytes || 0;
  state.mangleLastPackets = r.packets || 0;
  state.mangleLastTimestamp = Date.now();
  state.mangleStatRateHistory = new Array(30).fill(0);
  state.mangleStatPktHistory = new Array(30).fill(0);
  renderFwSparkline('mangle-stat-rate-svg', state.mangleStatRateHistory, 'bps', 'mangle-stat-legend-rate');
  renderFwSparkline('mangle-stat-pktrate-svg', state.mangleStatPktHistory, 'p/s', 'mangle-stat-legend-pktrate');

  toggleMangleActionFields();
  document.getElementById('mangle-modal').classList.remove('hidden');
}

function closeMangleModal() {
  stopMangleStatPolling();
  document.getElementById('mangle-modal').classList.add('hidden');
}

function copyMangleRule() {
  document.getElementById('mangle-modal-id').value = '';
  const badge = document.getElementById('mangle-modal-badge');
  if (badge) badge.innerText = 'New...';
  showToast('Rule Cloned', 'Ready to save as a new Mangle rule copy', 'info');
}

function resetMangleCounterDisplay() {
  state.mangleStatRateHistory = new Array(30).fill(0);
  state.mangleStatPktHistory = new Array(30).fill(0);
  state.mangleLastBytes = 0;
  state.mangleLastPackets = 0;
  state.mangleLastTimestamp = Date.now();
  const bEl = document.getElementById('mangle-stat-bytes');
  const pEl = document.getElementById('mangle-stat-packets');
  const rEl = document.getElementById('mangle-stat-rate');
  const prEl = document.getElementById('mangle-stat-pktrate');
  if (bEl) bEl.value = '0 B';
  if (pEl) pEl.value = '0';
  if (rEl) rEl.value = '0 bps';
  if (prEl) prEl.value = '0 p/s';
  renderFwSparkline('mangle-stat-rate-svg', state.mangleStatRateHistory, 'bps', 'mangle-stat-legend-rate');
  renderFwSparkline('mangle-stat-pktrate-svg', state.mangleStatPktHistory, 'p/s', 'mangle-stat-legend-pktrate');
  showToast('Counters Reset', 'Mangle rule counter display reset to 0', 'info');
}

async function applyMangleRule(closeAfter = false) {
  const id = document.getElementById('mangle-modal-id').value;
  if (!reviewLegacyFirewallSettings('mangle', id)) return;
  const chain = (document.getElementById('mangle-modal-chain').value || '').trim();
  const chainLower = chain.toLowerCase();
  const action = document.getElementById('mangle-modal-action').value;
  const comment = document.getElementById('mangle-modal-comment').value.trim();
  const enabled = document.getElementById('mangle-modal-enabled').checked;

  const src = getMangleFieldVal('src', true);
  const dst = getMangleFieldVal('dst', true);
  const srclist = getMangleFieldVal('srclist', true);
  const dstlist = getMangleFieldVal('dstlist', true);
  const srcgeo = getMangleFieldVal('srcgeo', true);
  const dstgeo = getMangleFieldVal('dstgeo', true);
  const proto = getMangleFieldVal('proto', true);
  const sport = getMangleFieldVal('sport', true);
  const dport = getMangleFieldVal('dport', true);
  const anyport = getMangleFieldVal('anyport', true);
  if ((sport || dport || anyport) && !['tcp', 'udp'].includes(proto)) {
    switchMangleRuleTab('general'); toggleMangleField('proto', true);
    showToast('Select protocol', 'Port matches require TCP or UDP without protocol inversion.', 'error'); document.getElementById('mangle-val-proto').focus(); return;
  }
  let iniface = getMangleFieldVal('iniface', true);
  let outiface = getMangleFieldVal('outiface', true);
  let inifacelist = getMangleFieldVal('inifacelist', true);
  let outifacelist = getMangleFieldVal('outifacelist', true);

  if (chainLower === 'prerouting' || chainLower === 'input') {
    outiface = '';
    outifacelist = '';
  } else if (chainLower === 'output' || chainLower === 'postrouting') {
    iniface = '';
    inifacelist = '';
  }

  if (!chain) { switchMangleRuleTab('general'); showToast('Mangle rule', 'Enter a chain.', 'error'); document.getElementById('mangle-modal-chain').focus(); return; }
  if (action === 'set-priority' && chainLower !== 'postrouting') {
    switchMangleRuleTab('general');
    showToast('Invalid Target for Chain', 'CLASSIFY (set-priority) requires POSTROUTING chain in iptables.', 'error');
    return;
  }
  const pktmark = getMangleFieldVal('pktmark', true);
  const connmark = getMangleFieldVal('connmark', true);
  const routingmark = getMangleFieldVal('routingmark', true);
  const conntype = getMangleFieldVal('conntype', false);

  const states = [];
  const csBox = document.getElementById('mangle-field-cs');
  if (csBox && !csBox.classList.contains('hidden')) {
    ['established', 'related', 'new', 'invalid', 'untracked'].forEach(s => {
      if (document.getElementById(`mangle-modal-cs-${s}`)?.checked) states.push(s);
    });
  }

  const natStates = [];
  const natBox = document.getElementById('mangle-field-natstate');
  if (natBox && !natBox.classList.contains('hidden')) {
    ['srcnat', 'dstnat'].forEach(s => {
      if (document.getElementById(`mangle-modal-nat-${s}`)?.checked) natStates.push(s);
    });
  }

  const payload = {
    ip_version: Number(document.getElementById('mangle-modal-family').value),
    id,
    chain,
    action,
    protocol: proto || 'all',
    src_address: src,
    dst_address: dst,
    src_port: sport,
    dst_port: dport,
    any_port: anyport,
    in_interface: iniface,
    out_interface: outiface,
    in_interface_list: inifacelist,
    out_interface_list: outifacelist,
    packet_mark: pktmark,
    connection_mark: connmark,
    routing_mark: routingmark,
    connection_type: conntype,
    connection_state: states,
    connection_nat_state: natStates,
    src_address_list: srclist,
    dst_address_list: dstlist,
    src_geoip: srcgeo,
    dst_geoip: dstgeo,
    comment,
    disabled: !enabled,

    // Advanced tab
    content: getMangleFieldVal('content', false),
    src_mac_address: (chainLower === 'output' || chainLower === 'postrouting') ? '' : getMangleFieldVal('srcmac', true),
    out_bridge_port: (chainLower === 'input' || chainLower === 'prerouting') ? '' : getMangleFieldVal('outbridgeport', false),
    in_bridge_port: (chainLower === 'output' || chainLower === 'postrouting') ? '' : getMangleFieldVal('inbridgeport', false),
    ipsec_policy: getMangleFieldVal('ipsec', false),
    dscp: getMangleFieldVal('dscp', false),
    tcp_mss: getMangleFieldVal('tcpmss', false),
    tos: document.getElementById('mangle-val-tos')?.value || '',
    packet_size: getMangleFieldVal('pktsize', false),
    random: getMangleFieldVal('random', false),
    tcp_flags: getMangleFieldVal('tcpflags', false),
    icmp_options: getMangleFieldVal('icmpoptions', false),
    ttl: getMangleFieldVal('ttl', false),

    // Extra tab
    nth: getMangleFieldVal('nth', false),
    connection_limit: getMangleFieldVal('connlimit', false),
    src_address_type: getMangleFieldVal('srcaddrtype', false),
    dst_address_type: getMangleFieldVal('dstaddrtype', false),
    ip_fragment: getMangleFieldVal('ipfragment', false),
    limit: getMangleFieldVal('limit', false),
    time: getMangleFieldVal('time', false),

    // Action tab
    new_connection_mark: action === 'mark-connection' ? (document.getElementById('mangle-modal-newconnmark')?.value.trim() || '') : '',
    new_routing_mark: action === 'mark-routing' ? (document.getElementById('mangle-modal-newroutingmark')?.value.trim() || '') : '',
    new_packet_mark: action === 'mark-packet' ? (document.getElementById('mangle-modal-newpktmark')?.value.trim() || '') : '',
    new_mss: action === 'change-mss' ? (document.getElementById('mangle-modal-newmss')?.value.trim() || '') : '',
    new_dscp: action === 'change-dscp' ? parseInt(document.getElementById('mangle-modal-newdscp')?.value || '0', 10) : 0,
    new_ttl: action === 'change-ttl' ? (document.getElementById('mangle-modal-newttl')?.value.trim() || '') : '',
    new_priority: action === 'set-priority' ? (document.getElementById('mangle-modal-newpriority')?.value.trim() || '') : '',
    passthrough: document.getElementById('mangle-modal-passthrough')?.checked ?? true,
    jump_target: action === 'jump' ? (document.getElementById('mangle-modal-jumptarget')?.value || '') : '',
    address_list: action.includes('address') ? (document.getElementById('mangle-modal-action-addrlist')?.value || '') : '',
    address_list_timeout: action.includes('address') ? (document.getElementById('mangle-modal-action-timeout')?.value || '') : '',
    log: document.getElementById('mangle-modal-log')?.checked || false,
    log_prefix: getMangleFieldVal('logprefix', false)
  };

  try {
    const res = await fetch(`${API_BASE}/firewall/mangle`, {
      method: 'POST',
      headers: { 'Content-Type': 'application/json' },
      body: JSON.stringify(payload)
    });
    if (res.ok) {
      const data = await res.json();
      showToast('Mangle Rule Saved', 'Marking rule updated', 'success');
      loadFirewall(false);
      if (closeAfter) {
        closeMangleModal();
      } else {
        if (data.id) {
          document.getElementById('mangle-modal-id').value = data.id;
          const badge = document.getElementById('mangle-modal-badge');
          if (badge) badge.innerText = `#${data.id}`;
        }
      }
    } else {
      const err = await res.json();
      showToast('Error', err.message || 'Failed to save mangle rule', 'error');
    }
  } catch (err) {
    showToast('Error', err.message, 'error');
  }
}

function submitSaveMangleRule(e) {
  if (e && e.preventDefault) e.preventDefault();
  return applyMangleRule(true);
}

function startMangleStatPolling() {
  stopMangleStatPolling();
  pollMangleRuleStats();
  state.mangleStatInterval = setInterval(pollMangleRuleStats, 1000);
}

function stopMangleStatPolling() {
  if (state.mangleStatInterval) {
    clearInterval(state.mangleStatInterval);
    state.mangleStatInterval = null;
  }
}

async function pollMangleRuleStats() {
  const id = document.getElementById('mangle-modal-id')?.value;
  if (!id) {
    renderFwSparkline('mangle-stat-rate-svg', state.mangleStatRateHistory || new Array(30).fill(0), 'bps', 'mangle-stat-legend-rate');
    renderFwSparkline('mangle-stat-pktrate-svg', state.mangleStatPktHistory || new Array(30).fill(0), 'p/s', 'mangle-stat-legend-pktrate');
    return;
  }

  try {
    const res = await fetch(`${API_BASE}/firewall/mangle`);
    if (!res.ok) return;
    const rules = await res.json();
    const r = rules.find(x => x.id === id);
    if (!r) return;

    const now = Date.now();
    const dt = Math.max(0.2, (now - (state.mangleLastTimestamp || now)) / 1000);
    state.mangleLastTimestamp = now;

    const curBytes = r.bytes || 0;
    const curPackets = r.packets || 0;

    const deltaBytes = Math.max(0, curBytes - (state.mangleLastBytes ?? curBytes));
    const deltaPkts = Math.max(0, curPackets - (state.mangleLastPackets ?? curPackets));

    state.mangleLastBytes = curBytes;
    state.mangleLastPackets = curPackets;

    const rateBps = Math.round((deltaBytes * 8) / dt);
    const ratePkt = Math.round(deltaPkts / dt);

    if (!state.mangleStatRateHistory) state.mangleStatRateHistory = new Array(30).fill(0);
    if (!state.mangleStatPktHistory) state.mangleStatPktHistory = new Array(30).fill(0);

    state.mangleStatRateHistory.push(rateBps);
    if (state.mangleStatRateHistory.length > 30) state.mangleStatRateHistory.shift();

    state.mangleStatPktHistory.push(ratePkt);
    if (state.mangleStatPktHistory.length > 30) state.mangleStatPktHistory.shift();

    const bEl = document.getElementById('mangle-stat-bytes');
    const pEl = document.getElementById('mangle-stat-packets');
    const rEl = document.getElementById('mangle-stat-rate');
    const prEl = document.getElementById('mangle-stat-pktrate');

    if (bEl) bEl.value = formatTraffic(curBytes).replace('/s', '');
    if (pEl) pEl.value = curPackets.toLocaleString();
    if (rEl) rEl.value = formatBps(rateBps);
    if (prEl) prEl.value = `${ratePkt.toLocaleString()} p/s`;

    renderFwSparkline('mangle-stat-rate-svg', state.mangleStatRateHistory, 'bps', 'mangle-stat-legend-rate');
    renderFwSparkline('mangle-stat-pktrate-svg', state.mangleStatPktHistory, 'p/s', 'mangle-stat-legend-pktrate');
  } catch (e) {
    console.error('Error polling Mangle rule stats', e);
  }
}

async function moveMangleRule(id, dir) {
  id = decodeURIComponent(id);
  try {
    const res = await fetch(`${API_BASE}/firewall/mangle/${encodeURIComponent(id)}/move`, {
      method: 'POST',
      headers: { 'Content-Type': 'application/json' },
      body: JSON.stringify({ direction: dir })
    });
    if (!res.ok) throw new Error(await responseError(res));
    await loadFirewall(false);
  } catch (err) {
    showToast('Error', err.message, 'error');
  }
}

async function toggleMangleRuleState(id, disabled) {
  id = decodeURIComponent(id);
  try {
    const res = await fetch(`${API_BASE}/firewall/mangle/${encodeURIComponent(id)}/state`, {
      method: 'POST',
      headers: { 'Content-Type': 'application/json' },
      body: JSON.stringify({ disabled })
    });
    if (!res.ok) throw new Error(await responseError(res));
    await loadFirewall(false);
  } catch (err) {
    showToast('Error', err.message, 'error');
  }
}

async function deleteMangleRule(id) {
  id = decodeURIComponent(id);
  if (!confirm('Are you sure you want to delete this mangle rule?')) return;
  try {
    const res = await fetch(`${API_BASE}/firewall/mangle/${encodeURIComponent(id)}`, { method: 'DELETE' });
    if (!res.ok) throw new Error(await responseError(res));
    {
      showToast('Deleted', 'Mangle rule removed', 'success');
      loadFirewall(false);
    }
  } catch (err) {
    showToast('Error', err.message, 'error');
  }
}

// ----------------- Address Lists -----------------
function renderAddressLists() {
  const filterList = document.getElementById('addrlist-filter-name')?.value || '';
  const tbody = document.getElementById('addrlist-table-body');
  const empty = document.getElementById('addrlist-empty');
  if (!tbody) return;
  tbody.innerHTML = '';

  const entries = (state.addressLists || []).filter(e => !filterList || e.name === filterList);
  document.getElementById('addrlist-count-badge').innerText = `${entries.length} Entries${entries.filter(e => e.dynamic).length >= 2000 ? ' (dynamic results capped at 2000)' : ''}`;

  // Update filter select
  const sel = document.getElementById('addrlist-filter-name');
  if (sel) {
    const cur = sel.value;
    sel.innerHTML = '<option value="">All Lists</option>';
    const set = new Set((state.addressLists || []).map(a => a.name));
    set.forEach(n => {
      const opt = document.createElement('option');
      opt.value = n;
      opt.innerText = n;
      if (n === cur) opt.selected = true;
      sel.appendChild(opt);
    });
  }

  if (entries.length === 0) {
    empty?.classList.remove('hidden');
    return;
  }
  empty?.classList.add('hidden');

  entries.forEach((raw, idx) => {
    const e = safeFirewallRow(raw);
    const tr = document.createElement('tr');
    tr.className = `hover:bg-slate-800/40 transition text-xs cursor-pointer ${e.disabled ? 'opacity-50' : ''}`;
    if (!e.dynamic) tr.setAttribute('ondblclick', `openEditAddrListModal('${e.id}')`);
    tr.innerHTML = `
      <td class="py-2.5 px-3 text-center text-slate-500 font-bold">${idx + 1}</td>
      <td class="py-2.5 px-3 text-center">${e.disabled ? '<span class="text-rose-400 font-bold" title="Disabled">X</span>' : '<span class="text-emerald-400 font-bold">✓</span>'}</td>
      <td class="py-2.5 px-3 font-bold text-white font-mono">${e.name}</td>
      <td class="py-2.5 px-3 font-mono font-bold text-emerald-400">${e.address}</td>
      <td class="py-2.5 px-3 text-slate-400 italic truncate max-w-[150px]">${e.dynamic ? 'Dynamic · '+(e.timeout ? e.timeout+'s remaining' : 'no expiry') : e.comment || '-'}</td>
      <td class="py-2.5 px-3 text-right space-x-2 font-sans whitespace-nowrap">
${e.dynamic ? '' : `        <button onclick="toggleAddrListState('${e.id}', ${!e.disabled})" class="text-xs ${e.disabled ? 'text-emerald-400' : 'text-slate-400'} hover:underline">${e.disabled ? 'Enable' : 'Disable'}</button>
        <button onclick="openEditAddrListModal('${e.id}')" class="text-xs text-cyan-400 hover:text-cyan-300 font-medium">Edit</button>
`}
        <button onclick="deleteAddrList('${e.id}')" class="text-xs text-slate-500 hover:text-rose-400">Delete</button>
      </td>
    `;
    tbody.appendChild(tr);
  });
  populateCommonAddrListDatalist();
}

function openAddAddrListModal() {
  document.getElementById('addrlist-modal-title').innerText = 'Add Address List Entry';
  document.getElementById('addrlist-modal-id').value = '';
  document.getElementById('addrlist-modal-name').value = '';
  document.getElementById('addrlist-modal-addr').value = '';
  document.getElementById('addrlist-modal-comment').value = '';
  document.getElementById('addrlist-modal-disabled').checked = false;
  const submitBtn = document.getElementById('addrlist-modal-submit-btn');
  if (submitBtn) submitBtn.innerText = 'Add to List';
  document.getElementById('addrlist-modal').classList.remove('hidden');
}

function openEditAddrListModal(id) {
  id = decodeURIComponent(id);
  const e = (state.addressLists || []).find(item => item.id === id);
  if (!e) return;

  document.getElementById('addrlist-modal-title').innerText = `Edit Address List Entry: ${e.name}`;
  document.getElementById('addrlist-modal-id').value = e.id;
  document.getElementById('addrlist-modal-name').value = e.name;
  document.getElementById('addrlist-modal-addr').value = e.address;
  document.getElementById('addrlist-modal-comment').value = e.comment || '';
  document.getElementById('addrlist-modal-disabled').checked = !!e.disabled;
  const submitBtn = document.getElementById('addrlist-modal-submit-btn');
  if (submitBtn) submitBtn.innerText = 'Save Changes';
  document.getElementById('addrlist-modal').classList.remove('hidden');
}

function closeAddrListModal() {
  document.getElementById('addrlist-modal').classList.add('hidden');
}

async function submitSaveAddrList(e) {
  e.preventDefault();
  const id = document.getElementById('addrlist-modal-id').value;
  const name = document.getElementById('addrlist-modal-name').value.trim();
  const addr = document.getElementById('addrlist-modal-addr').value.trim();
  const comment = document.getElementById('addrlist-modal-comment').value.trim();
  const disabled = document.getElementById('addrlist-modal-disabled').checked;

  try {
    const res = await fetch(`${API_BASE}/firewall/address-lists`, {
      method: 'POST',
      headers: { 'Content-Type': 'application/json' },
      body: JSON.stringify({ id, name, address: addr, comment, disabled })
    });
    if (res.ok) {
      showToast('Address List Item Saved', `Saved ${addr} in ${name}`, 'success');
      closeAddrListModal();
      loadFirewall(false);
    } else {
      const err = await res.json();
      showToast('Error', err.message || 'Failed to save address list', 'error');
    }
  } catch (err) {
    showToast('Error', err.message, 'error');
  }
}

async function toggleAddrListState(id, disabled) {
  id = decodeURIComponent(id);
  try {
    const res = await fetch(`${API_BASE}/firewall/address-lists/${encodeURIComponent(id)}/state`, {
      method: 'POST',
      headers: { 'Content-Type': 'application/json' },
      body: JSON.stringify({ disabled })
    });
    if (res.ok) {
      loadFirewall(false);
    }
  } catch (err) {
    showToast('Error', err.message, 'error');
  }
}

async function deleteAddrList(id) {
  id = decodeURIComponent(id);
  if (!confirm('Are you sure you want to delete this address list item?')) return;
  try {
    const res = await fetch(`${API_BASE}/firewall/address-lists/${encodeURIComponent(id)}`, { method: 'DELETE' });
    if (res.ok) {
      showToast('Deleted', 'Address list item removed', 'info');
      loadFirewall(false);
    }
  } catch (err) {
    showToast('Error', err.message, 'error');
  }
}

// ----------------- Geo-Location IP Management -----------------
async function loadGeoIP() {
  try {
    const [statusRes, countriesRes] = await Promise.all([
      fetch(`${API_BASE}/firewall/geoip/status`),
      fetch(`${API_BASE}/firewall/geoip/countries`)
    ]);

    if (statusRes.ok) state.geoStatus = await statusRes.json();
    if (countriesRes.ok) state.geoCountries = await countriesRes.json();

    updateGeoHeader();
    renderGeoCountries();
  } catch (err) {
    console.error('Failed to load GeoIP:', err);
  }
}

function getGeoUsageMap() {
  const usage = {};
  const checkRule = (r, type) => {
    ['src_geoip', 'dst_geoip'].forEach(field => {
      let val = (r && r[field]) || '';
      let code = val.replace(/^!/, '').replace(/^geo:/, '').replace(/^geo_/, '').toUpperCase().trim();
      if (code) {
        if (!usage[code]) usage[code] = [];
        const label = `${type} #${r.priority !== undefined ? r.priority : (r.id || '')}`;
        if (!usage[code].includes(label)) usage[code].push(label);
      }
    });
  };
  (state.filterRules || []).forEach(r => checkRule(r, 'Filter'));
  (state.natRules || []).forEach(r => checkRule(r, 'NAT'));
  (state.mangleRules || []).forEach(r => checkRule(r, 'Mangle'));
  return usage;
}

function updateGeoHeader() {
  const s = state.geoStatus || {};
  const statusBadge = document.getElementById('geo-status-badge');
  if (statusBadge) {
    statusBadge.innerText = s.auto_update ? 'Auto-Update ON' : 'Auto-Update OFF';
    statusBadge.className = s.auto_update
      ? 'px-2 py-0.5 rounded text-[10px] font-mono font-bold bg-emerald-500/20 text-emerald-300 border border-emerald-500/30'
      : 'px-2 py-0.5 rounded text-[10px] font-mono font-bold bg-slate-800 text-slate-400';
  }

  const intervalLabel = document.getElementById('geo-interval-label');
  if (intervalLabel) {
    intervalLabel.innerText = `Every ${s.interval_hours || 24}h`;
  }

  const usageMap = getGeoUsageMap();
  const inUseCount = Object.keys(usageMap).length;

  const activeCountEl = document.getElementById('geo-stat-active-countries');
  if (activeCountEl) activeCountEl.innerText = inUseCount.toLocaleString();

  const totalSubnetsEl = document.getElementById('geo-stat-total-subnets');
  if (totalSubnetsEl) totalSubnetsEl.innerText = (s.total_subnets || 0).toLocaleString();

  const lastSyncEl = document.getElementById('geo-stat-last-sync');
  if (lastSyncEl) {
    if (s.last_updated && !s.last_updated.startsWith('0001')) {
      const d = new Date(s.last_updated);
      lastSyncEl.innerText = d.toLocaleDateString() + ' ' + d.toLocaleTimeString([], { hour: '2-digit', minute: '2-digit' });
    } else {
      lastSyncEl.innerText = 'Never (Sync Pending)';
    }
  }

  const nextSyncEl = document.getElementById('geo-stat-next-sync');
  if (nextSyncEl) {
    if (s.next_update && !s.next_update.startsWith('0001')) {
      const d = new Date(s.next_update);
      nextSyncEl.innerText = d.toLocaleDateString() + ' ' + d.toLocaleTimeString([], { hour: '2-digit', minute: '2-digit' });
    } else {
      nextSyncEl.innerText = '-';
    }
  }

  const badge = document.getElementById('fw-badge-geo');
  if (badge) badge.innerText = inUseCount || (state.geoCountries || []).filter(c => c.subnet_count > 0).length || 0;
}

function renderGeoCountries() {
  const tbody = document.getElementById('geo-table-body');
  const empty = document.getElementById('geo-empty');
  if (!tbody) return;
  tbody.innerHTML = '';

  const q = (document.getElementById('geo-search-input')?.value || '').trim().toLowerCase();
  const continent = document.getElementById('geo-continent-filter')?.value || '';
  const inUseOnly = document.getElementById('geo-filter-inuse-only')?.checked;
  const cachedOnly = document.getElementById('geo-filter-cached-only')?.checked;
  const usageMap = getGeoUsageMap();

  const countries = (state.geoCountries || []).filter(c => {
    const isUsed = !!usageMap[c.code];
    if (inUseOnly && !isUsed) return false;
    if (cachedOnly && (!c.subnet_count || c.subnet_count === 0)) return false;
    if (continent && c.continent !== continent) return false;
    if (q) {
      const matchCode = c.code.toLowerCase().includes(q);
      const matchName = c.name.toLowerCase().includes(q);
      if (!matchCode && !matchName) return false;
    }
    return true;
  });

  if (countries.length === 0) {
    empty?.classList.remove('hidden');
    return;
  }
  empty?.classList.add('hidden');

  countries.forEach(c => {
    const tr = document.createElement('tr');
    const isUsed = !!usageMap[c.code];
    const rulesUsing = usageMap[c.code] || [];
    tr.className = `hover:bg-slate-800/40 transition text-xs ${isUsed ? 'bg-emerald-950/20' : ''}`;

    let statusHtml = '';
    if (isUsed) {
      statusHtml = `<span class="px-2 py-0.5 rounded text-[10px] font-mono font-bold bg-emerald-500/20 text-emerald-300 border border-emerald-500/40" title="Assigned in: ${rulesUsing.join(', ')}">IN USE (${rulesUsing.length})</span>`;
    } else if (c.subnet_count > 0) {
      statusHtml = '<span class="px-2 py-0.5 rounded text-[10px] font-mono text-cyan-300 bg-cyan-950/40 border border-cyan-800/40">CACHED</span>';
    } else {
      statusHtml = '<span class="px-2 py-0.5 rounded text-[10px] font-mono text-slate-500 bg-slate-800/60">READY</span>';
    }

    tr.innerHTML = `
      <td class="py-2.5 px-3 text-center">
        <span class="px-2 py-0.5 rounded font-mono font-bold ${isUsed ? 'bg-emerald-500/20 text-emerald-300 border border-emerald-500/40' : 'bg-slate-800 text-cyan-300 border border-slate-700'}">
          ${c.code}
        </span>
      </td>
      <td class="py-2.5 px-3 font-bold text-white">${c.name}</td>
      <td class="py-2.5 px-3 text-slate-400">${c.continent}</td>
      <td class="py-2.5 px-3 font-mono ${c.subnet_count > 0 ? 'text-emerald-400 font-bold' : 'text-slate-500'}">
        ${c.subnet_count > 0 ? c.subnet_count.toLocaleString() + ' CIDRs' : 'Not Cached'}
      </td>
      <td class="py-2.5 px-3 font-mono text-purple-300">${c.ipset_name}</td>
      <td class="py-2.5 px-3">
        ${statusHtml}
      </td>
      <td class="py-2.5 px-3 text-right space-x-2 font-sans whitespace-nowrap">
        <button onclick="updateGeoCountry('${c.code}')" class="text-xs text-cyan-400 hover:text-cyan-300 font-medium" title="Re-download latest country IP blocks">Sync</button>
        <button onclick="viewGeoSubnets('${c.code}')" class="text-xs text-slate-400 hover:text-white" title="Preview Subnet Ranges">View</button>
      </td>
    `;
    tbody.appendChild(tr);
  });
}

function quickFilterGeo(preset) {
  const searchInput = document.getElementById('geo-search-input');
  const continentSel = document.getElementById('geo-continent-filter');
  const inUseCheck = document.getElementById('geo-filter-inuse-only');
  const cachedCheck = document.getElementById('geo-filter-cached-only');

  if (searchInput) searchInput.value = '';
  if (continentSel) continentSel.value = '';
  if (inUseCheck) inUseCheck.checked = false;
  if (cachedCheck) cachedCheck.checked = false;

  if (preset === 'GR') {
    if (searchInput) searchInput.value = 'Greece';
  } else if (preset === 'Europe') {
    if (continentSel) continentSel.value = 'Europe';
  } else if (preset === 'HIGHRISK') {
    if (searchInput) searchInput.value = 'China';
  }
  renderGeoCountries();
}

async function toggleGeoCountry(code, enabled) {
  try {
    const res = await fetch(`${API_BASE}/firewall/geoip/countries/${encodeURIComponent(code)}/toggle`, {
      method: 'POST',
      headers: { 'Content-Type': 'application/json' },
      body: JSON.stringify({ enabled })
    });
    if (res.ok) {
      showToast(enabled ? 'Country Enabled' : 'Country Disabled', `${code} ${enabled ? 'active in firewall' : 'removed from firewall'}`, 'success');
      loadGeoIP();
    } else {
      const err = await res.json();
      showToast('Error', err.message || 'Failed to toggle country', 'error');
    }
  } catch (err) {
    showToast('Error', err.message, 'error');
  }
}

async function updateGeoCountry(code) {
  try {
    showToast('Syncing Country', `Downloading latest IP blocks for ${code}...`, 'info');
    const res = await fetch(`${API_BASE}/firewall/geoip/countries/${encodeURIComponent(code)}/update`, { method: 'POST' });
    if (res.ok) {
      const data = await res.json();
      showToast('Synced', `Loaded ${data.subnets} CIDR blocks for ${code}`, 'success');
      loadGeoIP();
    } else {
      const err = await res.json();
      showToast('Sync Error', err.message || 'Failed to sync country', 'error');
    }
  } catch (err) {
    showToast('Error', err.message, 'error');
  }
}

async function triggerGeoUpdateNow() {
  const spinner = document.getElementById('geo-update-spinner');
  if (spinner) spinner.classList.remove('hidden');

  try {
    const res = await fetch(`${API_BASE}/firewall/geoip/update-now`, { method: 'POST' });
    if (res.ok) {
      showToast('Update Started', 'Updating all active GeoIP country zones in background...', 'info');
      setTimeout(() => {
        loadGeoIP();
        if (spinner) spinner.classList.add('hidden');
      }, 2500);
    } else {
      const err = await res.json();
      showToast('Notice', err.message || 'Update in progress', 'info');
      if (spinner) spinner.classList.add('hidden');
    }
  } catch (err) {
    showToast('Error', err.message, 'error');
    if (spinner) spinner.classList.add('hidden');
  }
}

async function applyGeoPreset(preset) {
  try {
    const res = await fetch(`${API_BASE}/firewall/geoip/batch-toggle`, {
      method: 'POST',
      headers: { 'Content-Type': 'application/json' },
      body: JSON.stringify({ preset, enabled: preset !== 'NONE' })
    });
    if (res.ok) {
      showToast('Preset Applied', `Preset ${preset} updated in firewall`, 'success');
      loadGeoIP();
    }
  } catch (err) {
    showToast('Error', err.message, 'error');
  }
}

function openGeoIntervalModal() {
  const s = state.geoStatus || {};
  document.getElementById('geo-cfg-autoupdate').checked = s.auto_update !== false;

  const sel = document.getElementById('geo-cfg-interval');
  const customBox = document.getElementById('geo-cfg-custom-box');
  const customHoursInput = document.getElementById('geo-cfg-custom-hours');

  const curHours = s.interval_hours || 24;
  const matchOption = Array.from(sel.options).find(o => parseInt(o.value, 10) === curHours);

  if (matchOption) {
    sel.value = String(curHours);
    customBox.classList.add('hidden');
  } else {
    sel.value = 'custom';
    customHoursInput.value = curHours;
    customBox.classList.remove('hidden');
  }

  document.getElementById('geo-interval-modal').classList.remove('hidden');
}

function closeGeoIntervalModal() {
  document.getElementById('geo-interval-modal').classList.add('hidden');
}

function toggleCustomGeoInterval() {
  const val = document.getElementById('geo-cfg-interval').value;
  const customBox = document.getElementById('geo-cfg-custom-box');
  if (val === 'custom') {
    customBox.classList.remove('hidden');
  } else {
    customBox.classList.add('hidden');
  }
}

async function submitGeoIntervalSettings(e) {
  e.preventDefault();
  const autoUpdate = document.getElementById('geo-cfg-autoupdate').checked;
  const intervalVal = document.getElementById('geo-cfg-interval').value;
  let hours = 24;

  if (intervalVal === 'custom') {
    hours = parseInt(document.getElementById('geo-cfg-custom-hours').value, 10) || 24;
  } else {
    hours = parseInt(intervalVal, 10) || 24;
  }

  try {
    const res = await fetch(`${API_BASE}/firewall/geoip/config`, {
      method: 'POST',
      headers: { 'Content-Type': 'application/json' },
      body: JSON.stringify({ auto_update: autoUpdate, interval_hours: hours })
    });
    if (res.ok) {
      showToast('Schedule Saved', `Auto-update set to every ${hours} hours`, 'success');
      closeGeoIntervalModal();
      loadGeoIP();
    } else {
      const err = await res.json();
      showToast('Error', err.message || 'Failed to save schedule', 'error');
    }
  } catch (err) {
    showToast('Error', err.message, 'error');
  }
}

async function viewGeoSubnets(code, name) {
  if (!name) {
    const found = (state.geoCountries || []).find(x => x.code === code);
    name = found ? found.name : code;
  }
  document.getElementById('geo-subnets-title').innerText = `${name} (${code}) Subnets`;
  document.getElementById('geo-subnets-subtitle').innerText = `Kernel IPSet: mk_geo_${code}`;
  const listEl = document.getElementById('geo-subnets-list');
  listEl.innerHTML = '<span class="text-slate-500">Loading subnets...</span>';
  document.getElementById('geo-subnets-modal').classList.remove('hidden');

  try {
    const res = await fetch(`${API_BASE}/firewall/geoip/countries/${encodeURIComponent(code)}/subnets`);
    if (res.ok) {
      const data = await res.json();
      const subnets = data.subnets || [];
      if (subnets.length === 0) {
        listEl.innerHTML = '<span class="text-slate-500">No cached subnets found. Click Sync to download this zone.</span>';
      } else {
        listEl.innerHTML = subnets.map(s => `<div>${s}</div>`).join('');
      }
    } else {
      listEl.innerHTML = '<span class="text-rose-400">Failed to load subnets.</span>';
    }
  } catch (err) {
    listEl.innerHTML = `<span class="text-rose-400">Error: ${err.message}</span>`;
  }
}

function closeGeoSubnetsModal() {
  document.getElementById('geo-subnets-modal').classList.add('hidden');
}

// ----------------- Active Connections Tracking -----------------
async function loadConnections() {
  try {
    const res = await fetch(`${API_BASE}/firewall/connections`);
    const data = await res.json();
    if (!res.ok) throw new Error(data.message || 'Connection tracking unavailable');
    state.connections = Array.isArray(data) ? data : [];
    document.getElementById('fw-badge-connections').innerText = state.connections.length;
    document.getElementById('conns-count-badge').innerText = `${state.connections.length} Flows`;
    renderConnections();
  } catch (err) {
    console.error('Failed to load connections:', err);
    const badge=document.getElementById('conns-count-badge'); if(badge) badge.textContent='Unavailable: '+err.message;
  }
}

function renderConnections() {
  const search = (document.getElementById('conns-search-input')?.value || '').toLowerCase();
  const protoFilter = document.getElementById('conns-filter-proto')?.value || '';
  const tbody = document.getElementById('conns-table-body');
  const empty = document.getElementById('conns-empty');
  if (!tbody) return;
  tbody.innerHTML = '';

  const conns = (state.connections || []).filter(c => {
    if (protoFilter && c.protocol !== protoFilter) return false;
    if (search) {
      const line = `${c.protocol} ${c.src_address} ${c.dst_address} ${c.src_port} ${c.dst_port} ${c.tcp_state} ${c.connection_mark}`.toLowerCase();
      if (!line.includes(search)) return false;
    }
    return true;
  });

  if (conns.length === 0) {
    empty?.classList.remove('hidden');
    return;
  }
  empty?.classList.add('hidden');

  conns.slice(0, 150).forEach(c => {
    const tr = document.createElement('tr');
    tr.className = 'hover:bg-slate-800/40 transition text-xs';
    let stateColor = 'text-slate-400';
    if (c.tcp_state === 'ESTABLISHED') stateColor = 'text-emerald-400 font-bold';
    else if (c.tcp_state === 'TIME_WAIT' || c.tcp_state === 'SYN_SENT') stateColor = 'text-amber-400';

    tr.innerHTML = `
      <td class="py-2.5 px-3 font-bold text-cyan-400">${c.protocol}</td>
      <td class="py-2.5 px-3 font-mono text-white">${c.src_address}:${c.src_port}</td>
      <td class="py-2.5 px-3 font-mono text-white">${c.dst_address}:${c.dst_port}</td>
      <td class="py-2.5 px-3 font-mono text-slate-400">${c.reply_src_address ? c.reply_src_address + ':' + c.reply_src_port : '-'}</td>
      <td class="py-2.5 px-3 font-mono text-slate-400">${c.reply_dst_address ? c.reply_dst_address + ':' + c.reply_dst_port : '-'}</td>
      <td class="py-2.5 px-3 font-mono ${stateColor}">${c.tcp_state}</td>
      <td class="py-2.5 px-3 font-mono text-purple-300">${c.connection_mark || '-'}</td>
      <td class="py-2.5 px-3 text-slate-500">${c.timeout ? c.timeout + 's' : '-'}</td>
      <td class="py-2.5 px-3 text-right font-sans">
${['TCP','UDP','SCTP','DCCP','ICMP','ICMPV6'].includes(c.protocol) ? `        <button onclick="killConnection('${c.protocol}', '${c.src_address}', ${c.src_port}, '${c.dst_address}', ${c.dst_port}, ${c.ip_version || 4}, ${c.zone || 0}, ${c.icmp_id ?? 'null'}, ${c.icmp_type ?? 'null'}, ${c.icmp_code ?? 'null'})" class="text-xs text-rose-400 hover:text-rose-300">Kill</button>` : ''}
      </td>
    `;
    tbody.appendChild(tr);
  });
}

async function killConnection(protocol, src, sport, dst, dport, ip_version, zone, icmp_id, icmp_type, icmp_code) {
  try {
    const res = await fetch(`${API_BASE}/firewall/connections/kill`, {
      method: 'POST',
      headers: { 'Content-Type': 'application/json' },
      body: JSON.stringify({ protocol, src, sport, dst, dport, ip_version, zone, icmp_id, icmp_type, icmp_code })
    });
    if (res.ok) {
      showToast('Terminated', `Killed flow ${src}:${sport} -> ${dst}:${dport}`, 'info');
      loadConnections();
    } else { const error = await res.json(); showToast('Error', error.message || 'Unable to terminate this flow', 'error'); }
  } catch (err) {
    showToast('Error', err.message, 'error');
  }
}

async function resetFirewallCounters() {
  if (!confirm('Reset all firewall packet and byte counters to zero?')) return;
  try {
    const res = await fetch(`${API_BASE}/firewall/reset-counters`, { method: 'POST' });
    if (res.ok) {
      showToast('Counters Reset', 'All rules counters reset to 0', 'success');
      loadFirewall(false);
    }
  } catch (err) {
    showToast('Error', err.message, 'error');
  }
}

// ======================== MIKROTIK ROUTING & POLICY (/ip route) ========================
function switchRoutesSubTab(tab) {
  state.routesSubTab = tab;
  const tabs = ['routes', 'rules', 'tables'];
  tabs.forEach(t => {
    const panel = document.getElementById(`routes-subtab-${t}`);
    const btn = document.getElementById(`routes-subtab-btn-${t}`);
    if (panel) {
      if (t === tab) panel.classList.remove('hidden');
      else panel.classList.add('hidden');
    }
    if (btn) {
      if (t === tab) {
        btn.className = 'px-4 py-2.5 text-xs font-bold border-b-2 border-cyan-500 text-white transition flex items-center gap-2';
      } else {
        btn.className = 'px-4 py-2.5 text-xs font-bold border-b-2 border-transparent text-slate-400 hover:text-slate-200 transition flex items-center gap-2';
      }
    }
  });
  setTimeout(initTableSorting, 50);
}

async function loadRoutes() {
  try {
    const [routesRes, rulesRes, tablesRes] = await Promise.all([
      fetch(`${API_BASE}/routes`),
      fetch(`${API_BASE}/routing/rules`),
      fetch(`${API_BASE}/routing/tables`)
    ]);

    if (routesRes.ok) state.routes = await routesRes.json();
    if (rulesRes.ok) state.policyRules = await rulesRes.json();
    if (tablesRes.ok) state.routingTables = await tablesRes.json();

    const bRoutes = document.getElementById('routes-badge-routes');
    if (bRoutes) bRoutes.innerText = (state.routes || []).length;
    const showSystem = document.getElementById('prule-show-system')?.checked;
    const userRules = (state.policyRules || []).filter(pr => showSystem || (!pr.is_default && !pr.is_system));
    const bRules = document.getElementById('routes-badge-rules');
    if (bRules) bRules.innerText = userRules.length;
    const bTables = document.getElementById('routes-badge-tables');
    if (bTables) bTables.innerText = (state.routingTables || []).length;
    const bRoutesCount = document.getElementById('badge-routes-count');
    if (bRoutesCount) bRoutesCount.innerText = (state.routes || []).length;

    renderRoutesList();
    renderPolicyRules();
    renderRoutingTables();
  } catch (err) {
    console.error('Failed to load routing:', err);
  }
}

function getRouteProtocolBadge(proto) {
  const p = (proto || 'static').toLowerCase();
  switch (p) {
    case 'bgp':
      return `<span class="px-2 py-0.5 rounded text-[10px] font-bold font-mono uppercase bg-amber-500/20 text-amber-300 border border-amber-500/30">bgp</span>`;
    case 'ibgp':
      return `<span class="px-2 py-0.5 rounded text-[10px] font-bold font-mono uppercase bg-yellow-500/20 text-yellow-300 border border-yellow-500/30">ibgp</span>`;
    case 'ospf':
      return `<span class="px-2 py-0.5 rounded text-[10px] font-bold font-mono uppercase bg-emerald-500/20 text-emerald-300 border border-emerald-500/30">ospf</span>`;
    case 'rip':
      return `<span class="px-2 py-0.5 rounded text-[10px] font-bold font-mono uppercase bg-orange-500/20 text-orange-300 border border-orange-500/30">rip</span>`;
    case 'static':
      return `<span class="px-2 py-0.5 rounded text-[10px] font-bold font-mono uppercase bg-blue-500/20 text-blue-300 border border-blue-500/30">static</span>`;
    case 'connected':
      return `<span class="px-2 py-0.5 rounded text-[10px] font-bold font-mono uppercase bg-slate-800 text-slate-300 border border-slate-700">connected</span>`;
    case 'dhcp':
      return `<span class="px-2 py-0.5 rounded text-[10px] font-bold font-mono uppercase bg-cyan-500/20 text-cyan-300 border border-cyan-500/30">dhcp</span>`;
    case 'multicast':
      return `<span class="px-2 py-0.5 rounded text-[10px] font-bold font-mono uppercase bg-purple-500/20 text-purple-300 border border-purple-500/30">igmp</span>`;
    default:
      return `<span class="px-2 py-0.5 rounded text-[10px] font-bold font-mono uppercase bg-slate-800 text-slate-400 border border-slate-700">${escapeHtml(p)}</span>`;
  }
}

function renderRoutesList() {
  const tableFilter = document.getElementById('routes-filter-table')?.value || '';
  const typeFilter = document.getElementById('routes-filter-type')?.value || '';
  const tbody = document.getElementById('routes-table-body');
  const empty = document.getElementById('routes-empty');
  if (!tbody) return;

  // Update table filter select
  const sel = document.getElementById('routes-filter-table');
  if (sel) {
    const cur = sel.value;
    sel.innerHTML = '<option value="">All Tables</option>';
    (state.routingTables || []).forEach(t => {
      const opt = document.createElement('option');
      opt.value = t.name;
      opt.innerText = t.name;
      if (t.name === cur) opt.selected = true;
      sel.appendChild(opt);
    });
  }

  const routes = (state.routes || []).filter(r => {
    if (tableFilter && r.routing_table !== tableFilter) return false;
    if (typeFilter === 'ecmp' && !r.ecmp) return false;
    if (typeFilter === 'multicast' && !r.multicast) return false;
    if (typeFilter === 'static' && !r.static) return false;
    if (typeFilter === 'dynamic' && !r.dynamic) return false;
    if (typeFilter === 'connected' && !r.connect) return false;
    if (typeFilter === 'bgp' && (r.protocol || '').toLowerCase() !== 'bgp' && (r.protocol || '').toLowerCase() !== 'ibgp') return false;
    if (typeFilter === 'ospf' && (r.protocol || '').toLowerCase() !== 'ospf') return false;
    if (typeFilter === 'dhcp' && (r.protocol || '').toLowerCase() !== 'dhcp') return false;
    return true;
  });

  const ecmpCount = (state.routes || []).filter(r => r.ecmp).length;
  const mcCount = (state.routes || []).filter(r => r.multicast).length;
  let summaryText = `${routes.length} Routes`;
  if (ecmpCount > 0) summaryText += ` • ${ecmpCount} ECMP`;
  if (mcCount > 0) summaryText += ` • ${mcCount} Multicast/IGMP`;
  const badgeEl = document.getElementById('routes-count-badge');
  if (badgeEl) badgeEl.innerText = summaryText;

  if (routes.length === 0) {
    empty?.classList.remove('hidden');
    tbody.innerHTML = '';
    return;
  }
  empty?.classList.add('hidden');

  const sig = `${tableFilter}|${typeFilter}|` + routes.map(r => `${r.id}:${r.active}:${r.disabled}:${r.distance}:${r.protocol}:${r.health_status}:${(r.health_rtt_ms || 0).toFixed(0)}`).join(';');
  if (tbody.dataset.sig === sig) {
    return; // Routes table unchanged! Do not wipe DOM or flicker!
  }
  tbody.dataset.sig = sig;
  tbody.innerHTML = '';

  routes.forEach(r => {
    const tr = document.createElement('tr');
    tr.className = `hover:bg-slate-800/40 transition text-xs cursor-pointer ${r.disabled ? 'opacity-50' : ''}`;
    tr.setAttribute('ondblclick', `openEditRouteModal('${r.id}')`);

    // Routing Flags string: D=Dynamic, A=Active, C=Connect, S=Static, E=ECMP, M=Multicast, X=Disabled
    let flags = '';
    if (r.dynamic) flags += 'D';
    if (r.active) flags += 'A';
    if (r.connect) flags += 'C';
    if (r.static) flags += 'S';
    if (r.ecmp) flags += 'E';
    if (r.multicast) flags += 'M';
    if (r.disabled) flags += 'X';

    const isDefault = r.dst_address === 'default' || r.dst_address === '0.0.0.0/0';

    let healthCell = `<span class="text-slate-600 font-mono text-[11px]">-</span>`;
    if (r.check_gateway === 'internet') {
      if (r.health_status === 'online') {
        const ms = (r.health_rtt_ms || 0).toFixed(0);
        healthCell = `
          <span class="px-2 py-0.5 rounded text-[10px] font-mono bg-emerald-500/20 text-emerald-300 border border-emerald-500/30 font-semibold inline-flex items-center gap-1.5" title="Internet Verified via ${escapeHtml(r.check_target || '1.1.1.1')} (${r.health_loss_pct || 0}% loss)">
            <span class="w-1.5 h-1.5 rounded-full bg-emerald-400 animate-pulse"></span>
            <span>Internet OK (${ms}ms)</span>
          </span>
        `;
      } else if (r.health_status === 'offline') {
        healthCell = `
          <span class="px-2 py-0.5 rounded text-[10px] font-mono bg-rose-500/20 text-rose-300 border border-rose-500/40 font-bold inline-flex items-center gap-1.5 animate-pulse" title="Internet probe to ${escapeHtml(r.check_target || '1.1.1.1')} failed! Route withdrawn for failover.">
            <span class="w-1.5 h-1.5 rounded-full bg-rose-400"></span>
            <span>Internet Down</span>
          </span>
        `;
      } else {
        healthCell = `
          <span class="px-2 py-0.5 rounded text-[10px] font-mono bg-slate-800 text-slate-400 border border-slate-700 inline-flex items-center gap-1.5">
            <span class="w-1.5 h-1.5 rounded-full bg-amber-400 animate-ping"></span>
            <span>Checking...</span>
          </span>
        `;
      }
    } else if (r.check_gateway === 'ping') {
      if (r.health_status === 'online') {
        healthCell = `
          <span class="px-2 py-0.5 rounded text-[10px] font-mono bg-cyan-500/20 text-cyan-300 border border-cyan-500/30 font-semibold inline-flex items-center gap-1.5">
            <span class="w-1.5 h-1.5 rounded-full bg-cyan-400"></span>
            <span>Gateway OK (${(r.health_rtt_ms || 0).toFixed(0)}ms)</span>
          </span>
        `;
      } else if (r.health_status === 'offline') {
        healthCell = `
          <span class="px-2 py-0.5 rounded text-[10px] font-mono bg-rose-500/20 text-rose-300 border border-rose-500/40 font-bold inline-flex items-center gap-1.5">
            <span class="w-1.5 h-1.5 rounded-full bg-rose-400"></span>
            <span>Gateway Dead</span>
          </span>
        `;
      }
    }

    const flagDescriptions = [];
    if (r.dynamic) flagDescriptions.push('Dynamic (D)');
    if (r.active) flagDescriptions.push('Active (A)');
    if (r.connect) flagDescriptions.push('Connected (C)');
    if (r.static) flagDescriptions.push('Static (S)');
    if (r.ecmp) flagDescriptions.push('ECMP - Equal-Cost Multi-Path (E)');
    if (r.multicast) flagDescriptions.push('Multicast / IGMP Group (M)');
    if (r.disabled) flagDescriptions.push('Disabled (X)');

    tr.innerHTML = `
      <td class="py-2.5 px-3 text-center">
        <span class="px-1.5 py-0.5 rounded text-[10px] font-mono font-bold bg-slate-800 ${
          r.active ? (r.ecmp ? 'text-purple-300 border border-purple-500/40' : (r.multicast ? 'text-amber-300 border border-amber-500/40' : 'text-cyan-400 border border-cyan-800/40')) : (r.health_status === 'offline' ? 'text-rose-400 border border-rose-800/40' : 'text-slate-500')
        }" title="Flags: ${flagDescriptions.join(', ')}">
          ${flags || '-'}
        </span>
      </td>
      <td class="py-2.5 px-3">
        <div class="flex items-center gap-1.5 flex-wrap">
          <span class="font-bold ${isDefault ? 'text-cyan-300' : 'text-white'}">${escapeHtml(r.dst_address)}</span>
          ${r.ecmp ? `
            <span class="px-1.5 py-0.2 rounded text-[9px] font-mono font-bold bg-purple-500/20 text-purple-300 border border-purple-500/30 inline-flex items-center gap-1" title="Equal-Cost Multi-Path (ECMP / Multi-gateway)">
              <span>⚡ ECMP</span>
            </span>
          ` : ''}
          ${r.multicast ? `
            <span class="px-1.5 py-0.2 rounded text-[9px] font-mono font-bold bg-amber-500/20 text-amber-300 border border-amber-500/30 inline-flex items-center gap-1" title="Multicast / IGMP Group Route">
              <span>IGMP</span>
            </span>
          ` : ''}
        </div>
      </td>
      <td class="py-2.5 px-3">${getRouteProtocolBadge(r.protocol)}</td>
      <td class="py-2.5 px-3 text-slate-300 font-mono">${r.gateway || '<span class="text-slate-600 font-sans">Direct link</span>'}</td>
      <td class="py-2.5 px-3 text-slate-400 font-mono">${(r.distance !== undefined && r.distance !== null) ? r.distance : 0}</td>
      <td class="py-2.5 px-3 font-mono font-semibold text-purple-300">${r.routing_table || 'main'}</td>
      <td class="py-2.5 px-3 text-emerald-400 font-mono">${r.interface || '-'}</td>
      <td class="py-2.5 px-3">${healthCell}</td>
      <td class="py-2.5 px-3 text-slate-400 italic truncate max-w-[140px]">${r.comment || '-'}</td>
      <td class="py-2.5 px-3 text-right space-x-2 font-sans whitespace-nowrap">
        ${r.static ? `
          <button onclick="toggleRouteState('${r.id}', ${!r.disabled})" class="text-xs ${r.disabled ? 'text-emerald-400' : 'text-slate-400'} hover:underline">${r.disabled ? 'Enable' : 'Disable'}</button>
          <button onclick="openEditRouteModal('${r.id}')" class="text-xs text-cyan-400 hover:text-cyan-300 font-semibold">Edit</button>
          <button onclick="deleteRoute('${r.id}')" class="text-xs text-slate-500 hover:text-rose-400">Delete</button>
        ` : `
          <button onclick="openEditRouteModal('${r.id}')" class="text-xs text-slate-400 hover:text-white">View</button>
        `}
      </td>
    `;
    tbody.appendChild(tr);
  });
}

function openAddRouteModal() {
  document.getElementById('route-modal-title').innerText = 'Add Static Route';
  document.getElementById('route-modal-id').value = '';
  document.getElementById('route-modal-old-dst').value = '';
  document.getElementById('route-modal-old-gw').value = '';
  document.getElementById('route-modal-old-distance').value = '';
  document.getElementById('route-modal-old-table').value = '';
  document.getElementById('route-modal-old-iface').value = '';

  const dstInput = document.getElementById('route-modal-dst');
  const gwInput = document.getElementById('route-modal-gw');
  const distInput = document.getElementById('route-modal-distance');
  const ifaceSelect = document.getElementById('route-modal-iface');
  const tableSelect = document.getElementById('route-modal-table');
  const commentInput = document.getElementById('route-modal-comment');
  const disCheck = document.getElementById('route-modal-disabled');
  const saveBtn = document.querySelector('#route-modal button[type="submit"]');

  dstInput.disabled = false;
  dstInput.value = '0.0.0.0/0';
  gwInput.disabled = false;
  gwInput.value = '';
  distInput.disabled = false;
  distInput.value = '1';
  ifaceSelect.disabled = false;
  tableSelect.disabled = false;
  commentInput.disabled = false;
  commentInput.value = '';
  disCheck.disabled = false;
  disCheck.checked = false;
  if (saveBtn) saveBtn.classList.remove('hidden');

  const checkGw = document.getElementById('route-modal-check-gw');
  if (checkGw) checkGw.value = 'internet';
  const checkTarget = document.getElementById('route-modal-check-target');
  if (checkTarget) checkTarget.value = '1.1.1.1';
  const checkInterval = document.getElementById('route-modal-check-interval');
  if (checkInterval) checkInterval.value = '5';
  const checkThresh = document.getElementById('route-modal-check-threshold');
  if (checkThresh) checkThresh.value = '3';
  toggleRouteCheckModeUI();

  populateInterfaceSelect('route-modal-iface');

  // Populate tables
  tableSelect.innerHTML = '';
  (state.routingTables || [{ name: 'main' }]).forEach(t => {
    const opt = document.createElement('option');
    opt.value = t.name;
    opt.innerText = t.name;
    if (t.name === 'main') opt.selected = true;
    tableSelect.appendChild(opt);
  });

  document.getElementById('route-modal').classList.remove('hidden');
}

function openEditRouteModal(id) {
  const r = (state.routes || []).find(route => route.id === id);
  if (!r) return;

  const isStatic = !!r.static;
  document.getElementById('route-modal-title').innerText = isStatic
    ? `Edit Route: ${r.dst_address}`
    : `Route Properties (Read Only): ${r.dst_address}`;

  document.getElementById('route-modal-id').value = r.id;
  document.getElementById('route-modal-old-dst').value = r.dst_address || '';
  document.getElementById('route-modal-old-gw').value = r.gateway || '';
  document.getElementById('route-modal-old-distance').value = (r.distance !== undefined && r.distance !== null) ? r.distance : '';
  document.getElementById('route-modal-old-table').value = r.routing_table || 'main';
  document.getElementById('route-modal-old-iface').value = r.interface || '';

  const dstInput = document.getElementById('route-modal-dst');
  const gwInput = document.getElementById('route-modal-gw');
  const distInput = document.getElementById('route-modal-distance');
  const ifaceSelect = document.getElementById('route-modal-iface');
  const tableSelect = document.getElementById('route-modal-table');
  const commentInput = document.getElementById('route-modal-comment');
  const disCheck = document.getElementById('route-modal-disabled');
  const saveBtn = document.querySelector('#route-modal button[type="submit"]');

  dstInput.value = r.dst_address;
  gwInput.value = r.gateway || '';
  distInput.value = (r.distance !== undefined && r.distance !== null) ? r.distance : 1;
  commentInput.value = r.comment || '';
  disCheck.checked = !!r.disabled;

  const checkGw = document.getElementById('route-modal-check-gw');
  if (checkGw) checkGw.value = r.check_gateway || 'none';
  const checkTarget = document.getElementById('route-modal-check-target');
  if (checkTarget) checkTarget.value = r.check_target || '1.1.1.1';
  const checkInterval = document.getElementById('route-modal-check-interval');
  if (checkInterval) checkInterval.value = r.check_interval || 5;
  const checkThresh = document.getElementById('route-modal-check-threshold');
  if (checkThresh) checkThresh.value = r.check_threshold || 3;
  toggleRouteCheckModeUI();

  dstInput.disabled = !isStatic;
  gwInput.disabled = !isStatic;
  distInput.disabled = !isStatic;
  ifaceSelect.disabled = !isStatic;
  tableSelect.disabled = !isStatic;
  commentInput.disabled = !isStatic;
  disCheck.disabled = !isStatic;
  if (checkGw) checkGw.disabled = !isStatic;
  if (checkTarget) checkTarget.disabled = !isStatic;
  if (checkInterval) checkInterval.disabled = !isStatic;
  if (checkThresh) checkThresh.disabled = !isStatic;

  if (saveBtn) {
    if (isStatic) {
      saveBtn.classList.remove('hidden');
    } else {
      saveBtn.classList.add('hidden');
    }
  }

  populateInterfaceSelect('route-modal-iface', r.interface);

  tableSelect.innerHTML = '';
  (state.routingTables || [{ name: 'main' }]).forEach(t => {
    const opt = document.createElement('option');
    opt.value = t.name;
    opt.innerText = t.name;
    if (t.name === (r.routing_table || 'main')) opt.selected = true;
    tableSelect.appendChild(opt);
  });

  document.getElementById('route-modal').classList.remove('hidden');
}

function closeRouteModal() {
  document.getElementById('route-modal').classList.add('hidden');
}

function setRouteCheckTarget(ip) {
  const inp = document.getElementById('route-modal-check-target');
  if (inp) inp.value = ip;
}

function toggleRouteCheckModeUI() {
  const mode = document.getElementById('route-modal-check-gw')?.value || 'none';
  const targetRow = document.getElementById('route-row-check-target');
  const paramsRow = document.getElementById('route-row-check-params');

  if (mode === 'none') {
    if (targetRow) targetRow.classList.add('opacity-40', 'pointer-events-none');
    if (paramsRow) paramsRow.classList.add('opacity-40', 'pointer-events-none');
  } else if (mode === 'ping') {
    if (targetRow) targetRow.classList.add('opacity-40', 'pointer-events-none');
    if (paramsRow) paramsRow.classList.remove('opacity-40', 'pointer-events-none');
  } else { // internet
    if (targetRow) targetRow.classList.remove('opacity-40', 'pointer-events-none');
    if (paramsRow) paramsRow.classList.remove('opacity-40', 'pointer-events-none');
  }
}

async function submitSaveRoute(e) {
  e.preventDefault();
  const id = document.getElementById('route-modal-id').value;
  const oldDst = document.getElementById('route-modal-old-dst')?.value || '';
  const oldGw = document.getElementById('route-modal-old-gw')?.value || '';
  const oldDistStr = document.getElementById('route-modal-old-distance')?.value;
  const oldTable = document.getElementById('route-modal-old-table')?.value || '';
  const oldIface = document.getElementById('route-modal-old-iface')?.value || '';

  const dst = document.getElementById('route-modal-dst').value.trim();
  const gw = document.getElementById('route-modal-gw').value.trim();
  const table = document.getElementById('route-modal-table').value;
  const distance = parseInt(document.getElementById('route-modal-distance').value, 10) || 0;
  const iface = document.getElementById('route-modal-iface').value;
  const comment = document.getElementById('route-modal-comment').value.trim();
  const disabled = document.getElementById('route-modal-disabled').checked;

  const check_gateway = document.getElementById('route-modal-check-gw')?.value || 'none';
  const check_target = document.getElementById('route-modal-check-target')?.value.trim() || '1.1.1.1';
  const check_interval = parseInt(document.getElementById('route-modal-check-interval')?.value, 10) || 5;
  const check_threshold = parseInt(document.getElementById('route-modal-check-threshold')?.value, 10) || 3;

  if (!dst) {
    showToast('Error', 'Destination address is required', 'error');
    return;
  }
  if (!gw && !iface) {
    showToast('Error', 'Either Gateway IP or Interface must be specified', 'error');
    return;
  }

  const payload = {
    id,
    old_dst_address: oldDst,
    old_gateway: oldGw,
    old_routing_table: oldTable,
    old_interface: oldIface,
    dst_address: dst,
    gateway: gw || iface,
    routing_table: table,
    distance,
    interface: iface,
    comment,
    disabled,
    check_gateway,
    check_target,
    check_interval,
    check_threshold
  };

  if (oldDistStr !== undefined && oldDistStr !== '') {
    payload.old_distance = parseInt(oldDistStr, 10);
  }

  try {
    const res = await fetch(`${API_BASE}/routes`, {
      method: 'POST',
      headers: { 'Content-Type': 'application/json' },
      body: JSON.stringify(payload)
    });
    if (res.ok) {
      showToast('Route Saved', `Route to ${dst} installed`, 'success');
      closeRouteModal();
      loadRoutes();
    } else {
      const err = await res.json();
      showToast('Error', err.message || 'Failed to save route', 'error');
    }
  } catch (err) {
    showToast('Error', err.message, 'error');
  }
}

async function toggleRouteState(id, disabled) {
  try {
    const res = await fetch(`${API_BASE}/routes/${encodeURIComponent(id)}/state`, {
      method: 'POST',
      headers: { 'Content-Type': 'application/json' },
      body: JSON.stringify({ disabled })
    });
    if (res.ok) loadRoutes();
  } catch (err) {
    showToast('Error', err.message, 'error');
  }
}

async function deleteRoute(id) {
  if (!confirm('Are you sure you want to delete this route?')) return;
  try {
    const res = await fetch(`${API_BASE}/routes/${encodeURIComponent(id)}`, { method: 'DELETE' });
    if (res.ok) {
      showToast('Deleted', 'Route removed', 'success');
      loadRoutes();
    }
  } catch (err) {
    showToast('Error', err.message, 'error');
  }
}

// ----------------- Policy Rules (/ip route rule) -----------------
function renderPolicyRules() {
  const tbody = document.getElementById('rules-table-body');
  const empty = document.getElementById('rules-empty');
  if (!tbody) return;

  const showSystem = document.getElementById('prule-show-system')?.checked;
  const filtered = (state.policyRules || []).filter(pr => showSystem || (!pr.is_default && !pr.is_system));

  const countBadge = document.getElementById('rules-count-badge');
  if (countBadge) countBadge.innerText = `${filtered.length} Rules`;
  const bRules = document.getElementById('routes-badge-rules');
  if (bRules) bRules.innerText = filtered.length;

  if (filtered.length === 0) {
    empty?.classList.remove('hidden');
    tbody.innerHTML = '';
    return;
  }
  empty?.classList.add('hidden');

  const sig = `${showSystem}|` + filtered.map(pr => `${pr.id}:${pr.priority}:${pr.src_address}:${pr.dst_address}:${pr.table}:${pr.routing_mark}`).join(';');
  if (tbody.dataset.sig === sig) return;
  tbody.dataset.sig = sig;
  tbody.innerHTML = '';

  filtered.forEach(pr => {
    const isSys = pr.is_default || pr.is_system;
    const tr = document.createElement('tr');
    tr.className = `hover:bg-slate-800/40 transition text-xs ${isSys ? 'opacity-70 bg-slate-950/20' : ''}`;
    tr.innerHTML = `
      <td class="py-2.5 px-3 font-mono text-cyan-400 font-bold">${pr.priority}</td>
      <td class="py-2.5 px-3 font-mono text-white">${pr.src_address || '<span class="text-slate-600">all</span>'}</td>
      <td class="py-2.5 px-3 font-mono text-white">${pr.dst_address || '<span class="text-slate-600">all</span>'}</td>
      <td class="py-2.5 px-3 font-mono font-bold text-purple-300">${pr.routing_mark || '<span class="text-slate-600">-</span>'}</td>
      <td class="py-2.5 px-3 font-mono font-bold text-amber-300">${pr.table}</td>
      <td class="py-2.5 px-3 font-mono text-slate-300">${pr.action}</td>
      <td class="py-2.5 px-3 text-right font-sans">
        ${!pr.is_default ? `
          <button onclick="deletePolicyRule('${pr.id}')" class="text-xs text-slate-500 hover:text-rose-400">Delete</button>
        ` : `<span class="text-slate-600 text-[10px]">Default</span>`}
      </td>
    `;
    tbody.appendChild(tr);
  });
}

function openAddPolicyRuleModal() {
  const userRules = (state.policyRules || []).filter(pr => !pr.is_default && !pr.is_system);
  document.getElementById('prule-modal-pref').value = userRules.length * 10 + 1000;
  document.getElementById('prule-modal-mark').value = '';
  document.getElementById('prule-modal-src').value = '';
  document.getElementById('prule-modal-dst').value = '';

  const sel = document.getElementById('prule-modal-table');
  sel.innerHTML = '';
  (state.routingTables || []).forEach(t => {
    const opt = document.createElement('option');
    opt.value = t.name;
    opt.innerText = t.name;
    sel.appendChild(opt);
  });

  document.getElementById('prule-modal').classList.remove('hidden');
}

function closePolicyRuleModal() {
  document.getElementById('prule-modal').classList.add('hidden');
}

async function submitSavePolicyRule(e) {
  e.preventDefault();
  const pref = parseInt(document.getElementById('prule-modal-pref').value, 10) || 1000;
  const mark = document.getElementById('prule-modal-mark').value.trim();
  const src = document.getElementById('prule-modal-src').value.trim();
  const dst = document.getElementById('prule-modal-dst').value.trim();
  const table = document.getElementById('prule-modal-table').value;
  const action = document.getElementById('prule-modal-action').value;

  try {
    const res = await fetch(`${API_BASE}/routing/rules`, {
      method: 'POST',
      headers: { 'Content-Type': 'application/json' },
      body: JSON.stringify({ priority: pref, routing_mark: mark, src_address: src, dst_address: dst, table, action })
    });
    if (res.ok) {
      showToast('Rule Added', `Policy rule installed for table ${table}`, 'success');
      closePolicyRuleModal();
      loadRoutes();
    } else {
      const err = await res.json();
      showToast('Error', err.message, 'error');
    }
  } catch (err) {
    showToast('Error', err.message, 'error');
  }
}

async function deletePolicyRule(id) {
  if (!confirm('Are you sure you want to remove this policy rule?')) return;
  try {
    const res = await fetch(`${API_BASE}/routing/rules/${encodeURIComponent(id)}`, { method: 'DELETE' });
    if (res.ok) {
      showToast('Rule Removed', 'Policy rule deleted', 'success');
      loadRoutes();
    }
  } catch (err) {
    showToast('Error', err.message, 'error');
  }
}

// ----------------- Routing Tables -----------------
function renderRoutingTables() {
  const tbody = document.getElementById('tables-table-body');
  if (!tbody) return;
  const tables = state.routingTables || [];
  const sig = tables.map(t => `${t.table_id}:${t.name}:${t.comment}`).join(';');
  if (tbody.dataset.sig === sig) return;
  tbody.dataset.sig = sig;
  tbody.innerHTML = '';

  (state.routingTables || []).forEach(t => {
    const tr = document.createElement('tr');
    tr.className = 'hover:bg-slate-800/40 transition text-xs font-mono';
    tr.innerHTML = `
      <td class="py-2.5 px-3 text-cyan-400 font-bold">${t.table_id}</td>
      <td class="py-2.5 px-3 font-bold text-white">${t.name}</td>
      <td class="py-2.5 px-3 text-slate-400 italic">${t.comment || '-'}</td>
    `;
    tbody.appendChild(tr);
  });
}

function openAddTableModal() {
  document.getElementById('table-modal-name').value = '';
  document.getElementById('table-modal-id').value = '';
  document.getElementById('table-modal-comment').value = '';
  document.getElementById('table-modal').classList.remove('hidden');
}

function closeTableModal() {
  document.getElementById('table-modal').classList.add('hidden');
}

async function submitSaveTable(e) {
  e.preventDefault();
  const name = document.getElementById('table-modal-name').value.trim();
  const id = parseInt(document.getElementById('table-modal-id').value, 10) || 0;
  const comment = document.getElementById('table-modal-comment').value.trim();

  try {
    const res = await fetch(`${API_BASE}/routing/tables`, {
      method: 'POST',
      headers: { 'Content-Type': 'application/json' },
      body: JSON.stringify({ name, table_id: id, comment })
    });
    if (res.ok) {
      showToast('Table Created', `Routing table ${name} registered`, 'success');
      closeTableModal();
      loadRoutes();
    } else {
      const err = await res.json();
      showToast('Error', err.message, 'error');
    }
  } catch (err) {
    showToast('Error', err.message, 'error');
  }
}

async function loadDebianConfig() {
  const view = document.getElementById('debian-config-view');
  view.innerText = 'Generating live configuration...';
  try {
    const res = await fetch(`${API_BASE}/debian/config`);
    const data = await res.json();
    view.innerText = data.content || '# Empty config';
  } catch (err) {
    view.innerText = 'Failed to generate Debian network config.';
  }
}

async function saveDebianConfig() {
  try {
    const res = await fetch(`${API_BASE}/debian/apply`, { method: 'POST' });
    const data = await res.json();
    if (res.ok) {
      showToast('Configuration Saved', data.message || 'Saved to /etc/network/interfaces.d/vlans.cfg', 'success');
      loadDebianConfig();
    }
  } catch (err) {
    showToast('Error', err.message, 'error');
  }
}

function showToast(title, message, type = 'info') {
  const container = document.getElementById('toast-container');
  const toast = document.createElement('div');
  const borderColors = {
    success: 'border-emerald-500/40 bg-slate-900/95 text-emerald-400',
    error: 'border-rose-500/40 bg-slate-900/95 text-rose-400',
    info: 'border-cyan-500/40 bg-slate-900/95 text-cyan-400'
  };
  toast.className = `pointer-events-auto border rounded-xl p-4 shadow-2xl backdrop-blur-md flex items-start space-x-3 w-80 transform transition-all duration-300 translate-y-2 opacity-0 ${borderColors[type] || borderColors.info}`;
  toast.innerHTML = `
    <div class="flex-1">
      <div class="font-bold text-xs text-white">${escapeHtml(title)}</div>
      <div class="text-[11px] text-slate-300 mt-0.5 leading-relaxed font-sans">${escapeHtml(message)}</div>
    </div>
  `;
  container.appendChild(toast);
  requestAnimationFrame(() => toast.classList.remove('translate-y-2', 'opacity-0'));
  setTimeout(() => {
    toast.classList.add('opacity-0', 'translate-y-2');
    setTimeout(() => toast.remove(), 300);
  }, 4000);
}

function formatTraffic(bytesPerSec) {
  if (bytesPerSec < 1024) return `${Math.round(bytesPerSec)} B/s`;
  const kb = bytesPerSec / 1024;
  if (kb < 1024) return `${kb.toFixed(1)} KB/s`;
  const mb = kb / 1024;
  return `${mb.toFixed(2)} MB/s`;
}

function toggleSidebar() {
  const sb = document.getElementById('sidebar');
  sb.classList.toggle('-translate-x-full');
}

// ======================== EoIP (Ethernet over IP) ========================
async function loadEoIP(populate = true) {
  try {
    const res = await fetch(`${API_BASE}/vpn/eoip`);
    const data = await res.json();
    state.eoipTunnels = Array.isArray(data) ? data : [];

    const badge = document.getElementById('eoip-count-badge');
    if (badge) badge.innerText = `${state.eoipTunnels.length} Tunnels`;
    const sideBadge = document.getElementById('badge-eoip-count');
    if (sideBadge) sideBadge.innerText = state.eoipTunnels.length;

    renderEoIPTunnels();
  } catch (err) {
    console.error('Failed to load EoIP:', err);
  }
}

function renderEoIPTunnels() {
  const tbody = document.getElementById('eoip-table-body');
  const empty = document.getElementById('eoip-empty');
  if (!tbody) return;
  tbody.innerHTML = '';

  const tunnels = state.eoipTunnels || [];
  if (tunnels.length === 0) {
    empty?.classList.remove('hidden');
    return;
  }
  empty?.classList.add('hidden');

  tunnels.forEach(t => {
    const tr = document.createElement('tr');
    tr.className = `hover:bg-slate-800/40 transition text-xs ${t.disabled ? 'opacity-50' : ''}`;
    tr.innerHTML = `
      <td class="py-2.5 px-3 text-center">${renderMikroTikFlag(t.running, t.disabled)}</td>
      <td class="py-2.5 px-3 font-bold text-white font-mono">${t.name}</td>
      <td class="py-2.5 px-3 font-bold text-emerald-400 font-mono">${t.tunnel_id}</td>
      <td class="py-2.5 px-3 font-semibold text-emerald-400 font-mono">${t.ip_address || '<span class="text-slate-500 font-normal">Unassigned</span>'}</td>
      <td class="py-2.5 px-3 text-cyan-300 font-mono">${t.remote_address}</td>
      <td class="py-2.5 px-3 text-slate-400 font-mono">${t.local_address || '(any)'}</td>
      <td class="py-2.5 px-3 text-slate-300 font-mono text-[11px]">${t.mac_address || '-'}</td>
      <td class="py-2.5 px-3 text-slate-400 font-mono">${t.mtu || 1500}</td>
      <td class="py-2.5 px-3 font-mono text-[11px]">
        <span class="text-emerald-400">↓ ${t.rx_human || '0 B'}</span>
        <span class="text-cyan-400 ml-1">↑ ${t.tx_human || '0 B'}</span>
      </td>
      <td class="py-2.5 px-3 text-slate-400 italic truncate max-w-[120px]" title="${t.comment || ''}">${t.comment || '-'}</td>
      <td class="py-2.5 px-3 text-right space-x-1.5 font-sans whitespace-nowrap">
        <button onclick="toggleEoIPState('${t.id}', ${!t.disabled})" class="text-xs ${t.disabled ? 'text-emerald-400' : 'text-slate-400'} hover:underline">${t.disabled ? 'Enable' : 'Disable'}</button>
        <button onclick="openEditEoIPModal('${t.id}')" class="text-xs text-slate-400 hover:text-white">Edit</button>
        <button onclick="deleteEoIP('${t.id}')" class="text-xs text-rose-400 hover:text-rose-300">Delete</button>
      </td>
    `;
    tbody.appendChild(tr);
  });
}

function openAddEoIPModal() {
  document.getElementById('eoip-modal-title').innerText = 'Add EoIP Tunnel';
  document.getElementById('eoip-modal-id').value = '';
  document.getElementById('eoip-modal-name').value = `eoip-tunnel${(state.eoipTunnels || []).length + 1}`;
  document.getElementById('eoip-modal-tunnelid').value = (state.eoipTunnels || []).length + 10;
  document.getElementById('eoip-modal-remote').value = '';
  document.getElementById('eoip-modal-ip').value = '';
  document.getElementById('eoip-modal-local').value = '';
  document.getElementById('eoip-modal-mac').value = '';
  document.getElementById('eoip-modal-mtu').value = '1500';
  document.getElementById('eoip-modal-comment').value = '';
  document.getElementById('eoip-modal-clampmss').checked = true;
  document.getElementById('eoip-modal-disabled').checked = false;
  document.getElementById('eoip-modal').classList.remove('hidden');
}

function openEditEoIPModal(id) {
  const t = (state.eoipTunnels || []).find(tun => tun.id === id);
  if (!t) return;
  document.getElementById('eoip-modal-title').innerText = `Edit EoIP Tunnel (${t.name})`;
  document.getElementById('eoip-modal-id').value = t.id;
  document.getElementById('eoip-modal-name').value = t.name;
  document.getElementById('eoip-modal-tunnelid').value = t.tunnel_id;
  document.getElementById('eoip-modal-remote').value = t.remote_address;
  document.getElementById('eoip-modal-ip').value = t.ip_address || '';
  document.getElementById('eoip-modal-local').value = t.local_address || '';
  document.getElementById('eoip-modal-mac').value = t.mac_address || '';
  document.getElementById('eoip-modal-mtu').value = t.mtu || 1500;
  document.getElementById('eoip-modal-comment').value = t.comment || '';
  document.getElementById('eoip-modal-clampmss').checked = !!t.clamp_mss;
  document.getElementById('eoip-modal-disabled').checked = !!t.disabled;
  document.getElementById('eoip-modal').classList.remove('hidden');
}

function closeEoIPModal() {
  document.getElementById('eoip-modal').classList.add('hidden');
}

async function submitSaveEoIP(e) {
  e.preventDefault();
  const id = document.getElementById('eoip-modal-id').value;
  const name = document.getElementById('eoip-modal-name').value.trim();
  const tunnelId = parseInt(document.getElementById('eoip-modal-tunnelid').value);
  const remote = document.getElementById('eoip-modal-remote').value.trim();
  const ipAddress = document.getElementById('eoip-modal-ip').value.trim();
  const local = document.getElementById('eoip-modal-local').value.trim();
  const mac = document.getElementById('eoip-modal-mac').value.trim();
  const mtu = parseInt(document.getElementById('eoip-modal-mtu').value) || 1500;
  const comment = document.getElementById('eoip-modal-comment').value.trim();
  const clampMss = document.getElementById('eoip-modal-clampmss').checked;
  const disabled = document.getElementById('eoip-modal-disabled').checked;

  try {
    const res = await fetch(`${API_BASE}/vpn/eoip`, {
      method: 'POST',
      headers: { 'Content-Type': 'application/json' },
      body: JSON.stringify({
        id,
        name,
        tunnel_id: tunnelId,
        remote_address: remote,
        ip_address: ipAddress,
        local_address: local,
        mac_address: mac,
        mtu,
        clamp_mss: clampMss,
        comment,
        disabled
      })
    });
    if (res.ok) {
      showToast('EoIP Saved', `Tunnel ${name} configured successfully`, 'success');
      closeEoIPModal();
      loadEoIP(false);
      fetchData(false);
    } else {
      const err = await res.json();
      showToast('Error', err.message, 'error');
    }
  } catch (err) {
    showToast('Error', err.message, 'error');
  }
}

async function toggleEoIPState(id, disabled) {
  try {
    const res = await fetch(`${API_BASE}/vpn/eoip/${encodeURIComponent(id)}/state`, {
      method: 'POST',
      headers: { 'Content-Type': 'application/json' },
      body: JSON.stringify({ disabled })
    });
    if (res.ok) {
      showToast(disabled ? 'Disabled' : 'Enabled', 'EoIP tunnel state updated', 'info');
      loadEoIP(false);
      fetchData(false);
    }
  } catch (err) {
    showToast('Error', err.message, 'error');
  }
}

async function deleteEoIP(id) {
  if (!confirm('Are you sure you want to delete this EoIP tunnel?')) return;
  try {
    const res = await fetch(`${API_BASE}/vpn/eoip/${encodeURIComponent(id)}`, { method: 'DELETE' });
    if (res.ok) {
      showToast('Deleted', 'EoIP tunnel removed', 'success');
      loadEoIP(false);
      fetchData(false);
    }
  } catch (err) {
    showToast('Error', err.message, 'error');
  }
}

// ======================== VXLAN (Virtual Extensible LAN) ========================
async function loadVXLAN(populate = true) {
  try {
    const [tunnelsRes, vtepsRes] = await Promise.all([
      fetch(`${API_BASE}/vpn/vxlan`),
      fetch(`${API_BASE}/vpn/vxlan/vteps`)
    ]);

    if (tunnelsRes.ok) {
      state.vxlanTunnels = await tunnelsRes.json() || [];
    }
    if (vtepsRes.ok) {
      state.vxlanVteps = await vtepsRes.json() || [];
    }

    renderVXLANTable();
    renderVXLANVtepsTable();

    const countBadge = document.getElementById('vxlan-count-badge');
    if (countBadge) countBadge.innerText = `${(state.vxlanTunnels || []).length} Tunnels`;

    const vtepsCountBadge = document.getElementById('vxlan-vteps-count-badge');
    if (vtepsCountBadge) vtepsCountBadge.innerText = `${(state.vxlanVteps || []).length} VTEPs`;

    const navBadge = document.getElementById('badge-vxlan-count');
    if (navBadge) navBadge.innerText = (state.vxlanTunnels || []).length;
  } catch (err) {
    console.error('Error loading VXLAN:', err);
  }
}

function renderVXLANTable() {
  const tbody = document.getElementById('vxlan-table-body');
  const empty = document.getElementById('vxlan-empty');
  if (!tbody || !empty) return;

  tbody.innerHTML = '';
  const tunnels = state.vxlanTunnels || [];

  if (tunnels.length === 0) {
    empty.classList.remove('hidden');
    return;
  }
  empty.classList.add('hidden');

  tunnels.forEach(t => {
    const tr = document.createElement('tr');
    tr.className = 'hover:bg-slate-800/40 transition border-b border-slate-800/60';

    let flag = '';
    if (t.disabled) {
      flag = '<span class="px-1.5 py-0.5 rounded text-[10px] bg-slate-800 text-slate-400 font-bold border border-slate-700" title="Disabled">X</span>';
    } else if (t.running) {
      flag = '<span class="px-1.5 py-0.5 rounded text-[10px] bg-amber-950 text-amber-300 font-bold border border-amber-800/50" title="Running">R</span>';
    } else {
      flag = '<span class="px-1.5 py-0.5 rounded text-[10px] bg-rose-950 text-rose-300 font-bold border border-rose-800/50" title="Down">!</span>';
    }

    const vtepCount = (t.vteps || []).length;
    const underlayDesc = t.parent_interface || t.local_address ? `${t.parent_interface || '-'}${t.local_address ? ' / ' + t.local_address : ''}` : '(any)';

    tr.innerHTML = `
      <td class="py-2.5 px-3 text-center">${flag}</td>
      <td class="py-2.5 px-3 font-bold text-white font-mono">${escapeHtml(t.name)}</td>
      <td class="py-2.5 px-3 font-bold text-amber-400 font-mono">${t.vni}</td>
      <td class="py-2.5 px-3 text-slate-300 font-mono">${t.port || 4789}</td>
      <td class="py-2.5 px-3 font-semibold text-emerald-400 font-mono">${escapeHtml(t.ip_address || '') || '<span class="text-slate-500 font-normal">Unassigned</span>'}</td>
      <td class="py-2.5 px-3 text-slate-300 font-mono text-[11px]">${escapeHtml(underlayDesc)}</td>
      <td class="py-2.5 px-3 text-slate-400 font-mono text-[11px]">${escapeHtml(t.mac_address || '-')}</td>
      <td class="py-2.5 px-3 text-slate-400 font-mono">${t.mtu || 1500}</td>
      <td class="py-2.5 px-3 font-mono">
        <span class="px-2 py-0.5 rounded-full text-[10px] bg-slate-800 text-amber-300 border border-slate-700 cursor-pointer" onclick="openAddVXLANVtepModal('${escapeHtml(t.name)}')" title="Click to add VTEP peer">${vtepCount} VTEP${vtepCount === 1 ? '' : 's'}</span>
      </td>
      <td class="py-2.5 px-3 font-mono text-[11px]">
        <span class="text-emerald-400">↓ ${t.rx_human || '0 B'}</span>
        <span class="text-amber-400 ml-1">↑ ${t.tx_human || '0 B'}</span>
      </td>
      <td class="py-2.5 px-3 text-slate-400 italic truncate max-w-[120px]" title="${escapeHtml(t.comment || '')}">${escapeHtml(t.comment || '-')}</td>
      <td class="py-2.5 px-3 text-right space-x-1.5 font-sans whitespace-nowrap">
        <button onclick="toggleVXLANState('${t.id}', ${!t.disabled})" class="text-xs ${t.disabled ? 'text-amber-400' : 'text-slate-400'} hover:underline">${t.disabled ? 'Enable' : 'Disable'}</button>
        <button onclick="openEditVXLANModal('${t.id}')" class="text-xs text-slate-400 hover:text-white">Edit</button>
        <button onclick="deleteVXLAN('${t.id}')" class="text-xs text-rose-400 hover:text-rose-300">Delete</button>
      </td>
    `;
    tbody.appendChild(tr);
  });
}

function renderVXLANVtepsTable() {
  const tbody = document.getElementById('vxlan-vteps-table-body');
  const empty = document.getElementById('vxlan-vteps-empty');
  if (!tbody || !empty) return;

  tbody.innerHTML = '';
  const vteps = state.vxlanVteps || [];

  if (vteps.length === 0) {
    empty.classList.remove('hidden');
    return;
  }
  empty.classList.add('hidden');

  vteps.forEach(v => {
    const tr = document.createElement('tr');
    tr.className = 'hover:bg-slate-800/40 transition border-b border-slate-800/60';

    tr.innerHTML = `
      <td class="py-2.5 px-3 font-bold text-white font-mono">${escapeHtml(v.interface)}</td>
      <td class="py-2.5 px-3 text-amber-400 font-mono font-semibold">${escapeHtml(v.remote_ip)}</td>
      <td class="py-2.5 px-3 text-slate-300 font-mono">${v.port > 0 ? v.port : 'default'}</td>
      <td class="py-2.5 px-3 text-slate-400 italic truncate max-w-[150px]" title="${escapeHtml(v.comment || '')}">${escapeHtml(v.comment || '-')}</td>
      <td class="py-2.5 px-3 text-right font-sans whitespace-nowrap">
        <button onclick="deleteVXLANVtep('${escapeHtml(v.interface)}', '${escapeHtml(v.id || v.remote_ip)}')" class="text-xs text-rose-400 hover:text-rose-300">Delete</button>
      </td>
    `;
    tbody.appendChild(tr);
  });
}

function openAddVXLANModal() {
  document.getElementById('vxlan-modal-title').innerText = 'Add VXLAN Interface';
  document.getElementById('vxlan-modal-id').value = '';
  document.getElementById('vxlan-modal-name').value = `vxlan${(state.vxlanTunnels || []).length + 100}`;
  document.getElementById('vxlan-modal-vni').value = (state.vxlanTunnels || []).length + 100;
  document.getElementById('vxlan-modal-port').value = '4789';
  document.getElementById('vxlan-modal-ip').value = '';
  document.getElementById('vxlan-modal-parent').value = '';
  document.getElementById('vxlan-modal-local').value = '';
  document.getElementById('vxlan-modal-remote').value = '';
  document.getElementById('vxlan-modal-group').value = '';
  document.getElementById('vxlan-modal-mac').value = '';
  document.getElementById('vxlan-modal-mtu').value = '1500';
  document.getElementById('vxlan-modal-comment').value = '';
  document.getElementById('vxlan-modal-learning').checked = true;
  document.getElementById('vxlan-modal-disabled').checked = false;
  document.getElementById('vxlan-modal').classList.remove('hidden');
}

function openEditVXLANModal(id) {
  const t = (state.vxlanTunnels || []).find(tun => tun.id === id);
  if (!t) return;
  document.getElementById('vxlan-modal-title').innerText = `Edit VXLAN Interface (${t.name})`;
  document.getElementById('vxlan-modal-id').value = t.id;
  document.getElementById('vxlan-modal-name').value = t.name;
  document.getElementById('vxlan-modal-vni').value = t.vni;
  document.getElementById('vxlan-modal-port').value = t.port || 4789;
  document.getElementById('vxlan-modal-ip').value = t.ip_address || '';
  document.getElementById('vxlan-modal-parent').value = t.parent_interface || '';
  document.getElementById('vxlan-modal-local').value = t.local_address || '';
  document.getElementById('vxlan-modal-remote').value = t.remote_address || '';
  document.getElementById('vxlan-modal-group').value = t.group || '';
  document.getElementById('vxlan-modal-mac').value = t.mac_address || '';
  document.getElementById('vxlan-modal-mtu').value = t.mtu || 1500;
  document.getElementById('vxlan-modal-comment').value = t.comment || '';
  document.getElementById('vxlan-modal-learning').checked = t.learning !== false;
  document.getElementById('vxlan-modal-disabled').checked = !!t.disabled;
  document.getElementById('vxlan-modal').classList.remove('hidden');
}

function closeVXLANModal() {
  document.getElementById('vxlan-modal').classList.add('hidden');
}

async function submitSaveVXLAN(e) {
  e.preventDefault();
  const id = document.getElementById('vxlan-modal-id').value;
  const name = document.getElementById('vxlan-modal-name').value.trim();
  const vni = parseInt(document.getElementById('vxlan-modal-vni').value);
  const port = parseInt(document.getElementById('vxlan-modal-port').value) || 4789;
  const ipAddress = document.getElementById('vxlan-modal-ip').value.trim();
  const parentInterface = document.getElementById('vxlan-modal-parent').value.trim();
  const local = document.getElementById('vxlan-modal-local').value.trim();
  const remote = document.getElementById('vxlan-modal-remote').value.trim();
  const group = document.getElementById('vxlan-modal-group').value.trim();
  const mac = document.getElementById('vxlan-modal-mac').value.trim();
  const mtu = parseInt(document.getElementById('vxlan-modal-mtu').value) || 1500;
  const comment = document.getElementById('vxlan-modal-comment').value.trim();
  const learning = document.getElementById('vxlan-modal-learning').checked;
  const disabled = document.getElementById('vxlan-modal-disabled').checked;

  try {
    const res = await fetch(`${API_BASE}/vpn/vxlan`, {
      method: 'POST',
      headers: { 'Content-Type': 'application/json' },
      body: JSON.stringify({
        id,
        name,
        vni,
        port,
        ip_address: ipAddress,
        parent_interface: parentInterface,
        local_address: local,
        remote_address: remote,
        group,
        mac_address: mac,
        mtu,
        learning,
        comment,
        disabled
      })
    });
    if (res.ok) {
      showToast('VXLAN Saved', `Interface ${name} configured successfully`, 'success');
      closeVXLANModal();
      loadVXLAN(false);
      fetchData(false);
    } else {
      const err = await res.json();
      showToast('Error', err.message, 'error');
    }
  } catch (err) {
    showToast('Error', err.message, 'error');
  }
}

async function toggleVXLANState(id, disabled) {
  try {
    const res = await fetch(`${API_BASE}/vpn/vxlan/${encodeURIComponent(id)}/state`, {
      method: 'POST',
      headers: { 'Content-Type': 'application/json' },
      body: JSON.stringify({ disabled })
    });
    if (res.ok) {
      showToast(disabled ? 'Disabled' : 'Enabled', 'VXLAN interface state updated', 'info');
      loadVXLAN(false);
      fetchData(false);
    }
  } catch (err) {
    showToast('Error', err.message, 'error');
  }
}

async function deleteVXLAN(id) {
  if (!confirm('Are you sure you want to delete this VXLAN interface?')) return;
  try {
    const res = await fetch(`${API_BASE}/vpn/vxlan/${encodeURIComponent(id)}`, { method: 'DELETE' });
    if (res.ok) {
      showToast('Deleted', 'VXLAN interface removed', 'success');
      loadVXLAN(false);
      fetchData(false);
    }
  } catch (err) {
    showToast('Error', err.message, 'error');
  }
}

function openAddVXLANVtepModal(defaultIface = '') {
  const sel = document.getElementById('vxlan-vtep-modal-interface');
  if (sel) {
    sel.innerHTML = '';
    const tunnels = state.vxlanTunnels || [];
    tunnels.forEach(t => {
      const opt = document.createElement('option');
      opt.value = t.name;
      opt.innerText = `${t.name} (VNI ${t.vni})`;
      if (defaultIface && t.name === defaultIface) {
        opt.selected = true;
      }
      sel.appendChild(opt);
    });
  }
  document.getElementById('vxlan-vtep-modal-remote').value = '';
  document.getElementById('vxlan-vtep-modal-port').value = '';
  document.getElementById('vxlan-vtep-modal-comment').value = '';
  document.getElementById('vxlan-vtep-modal').classList.remove('hidden');
}

function closeVXLANVtepModal() {
  document.getElementById('vxlan-vtep-modal').classList.add('hidden');
}

async function submitSaveVXLANVtep(e) {
  e.preventDefault();
  const iface = document.getElementById('vxlan-vtep-modal-interface').value;
  const remote = document.getElementById('vxlan-vtep-modal-remote').value.trim();
  const port = parseInt(document.getElementById('vxlan-vtep-modal-port').value) || 0;
  const comment = document.getElementById('vxlan-vtep-modal-comment').value.trim();

  try {
    const res = await fetch(`${API_BASE}/vpn/vxlan/vteps`, {
      method: 'POST',
      headers: { 'Content-Type': 'application/json' },
      body: JSON.stringify({
        interface: iface,
        remote_ip: remote,
        port,
        comment
      })
    });
    if (res.ok) {
      showToast('VTEP Added', `Peer ${remote} added to ${iface}`, 'success');
      closeVXLANVtepModal();
      loadVXLAN(false);
      fetchData(false);
    } else {
      const err = await res.json();
      showToast('Error', err.message, 'error');
    }
  } catch (err) {
    showToast('Error', err.message, 'error');
  }
}

async function deleteVXLANVtep(iface, vtepIdOrIp) {
  if (!confirm(`Are you sure you want to remove VTEP ${vtepIdOrIp} from ${iface}?`)) return;
  try {
    const res = await fetch(`${API_BASE}/vpn/vxlan/${encodeURIComponent(iface)}/vteps/${encodeURIComponent(vtepIdOrIp)}`, {
      method: 'DELETE'
    });
    if (res.ok) {
      showToast('Deleted', 'Remote VTEP removed', 'success');
      loadVXLAN(false);
      fetchData(false);
    }
  } catch (err) {
    showToast('Error', err.message, 'error');
  }
}

// ======================== AeroTUN (Custom Encrypted VPN with Adaptive LZ4) ========================
const aeroRateSamples = new Map();
const aeroLiveRates = new Map();
async function loadAeroTUN(populate = true) {
  try {
    const [tunnelsRes, statsRes] = await Promise.all([
      fetch(`${API_BASE}/vpn/aerotun/tunnels`),
      fetch(`${API_BASE}/vpn/aerotun/stats`)
    ]);

    if (tunnelsRes.ok) {
      const data = await tunnelsRes.json();
      state.aerotunTunnels = Array.isArray(data) ? data : [];
      const now = Date.now();
      for (const t of state.aerotunTunnels) {
        const old = aeroRateSamples.get(t.id), seconds = old ? (now-old.time)/1000 : 0;
        if (seconds >= 0.5 && seconds <= 60 && t.rx_bytes >= old.rx && t.tx_bytes >= old.tx && t.packets_rx >= old.prx && t.packets_tx >= old.ptx) {
          aeroLiveRates.set(t.id,{rx:(t.rx_bytes-old.rx)*8/seconds/1e6,tx:(t.tx_bytes-old.tx)*8/seconds/1e6,prx:(t.packets_rx-old.prx)/seconds,ptx:(t.packets_tx-old.ptx)/seconds});
        } else if (!old || seconds > 60 || t.rx_bytes < old.rx || t.tx_bytes < old.tx) aeroLiveRates.delete(t.id);
        if (!old || seconds >= 0.5) aeroRateSamples.set(t.id,{time:now,rx:t.rx_bytes||0,tx:t.tx_bytes||0,prx:t.packets_rx||0,ptx:t.packets_tx||0});
      }
    }

    if (statsRes.ok) {
      state.aerotunStats = await statsRes.json();
    }

    const countBadge = document.getElementById('aerotun-count-badge');
    if (countBadge) countBadge.innerText = `${(state.aerotunTunnels || []).length} Tunnels`;

    const sideBadge = document.getElementById('badge-aerotun-count');
    if (sideBadge) sideBadge.innerText = (state.aerotunTunnels || []).length;

    renderAeroTUN();
    if (state.aeroHealthSelected) await refreshAeroTUNHealth();
  } catch (err) {
    console.error('Failed to load AeroTUN:', err);
  }
}

function renderAeroTUN() {
  const tbody = document.getElementById('aerotun-table-body');
  const empty = document.getElementById('aerotun-empty');

  // Update summary cards
  const stats = state.aerotunStats || {};
  const tunnels = state.aerotunTunnels || [];

  const statActive = document.getElementById('aerotun-stat-active');
  if (statActive) {
    const activeCount = tunnels.filter(t => t.connected).length;
    statActive.innerText = `${activeCount} / ${tunnels.length}`;
  }

  const statSaved = document.getElementById('aerotun-stat-saved');
  if (statSaved) {
    statSaved.innerText = formatBytes(stats.total_saved_bytes || 0);
  }

  const statRatio = document.getElementById('aerotun-stat-ratio');
  if (statRatio) {
    statRatio.innerText = stats.average_ratio || '1.00x (0% saved)';
  }

  const statTraffic = document.getElementById('aerotun-stat-traffic');
  if (statTraffic) {
    statTraffic.innerText = `↓ ${formatBytes(stats.total_rx_bytes || 0)} / ↑ ${formatBytes(stats.total_tx_bytes || 0)}`;
  }

  if (!tbody) return;
  tbody.innerHTML = '';

  if (tunnels.length === 0) {
    empty?.classList.remove('hidden');
    return;
  }
  empty?.classList.add('hidden');

  tunnels.forEach(t => {
    const tr = document.createElement('tr');
    tr.className = `hover:bg-slate-800/40 transition text-xs ${t.disabled ? 'opacity-50' : ''}`;

    const modeBadge = t.mode === 'server'
      ? `<span class="px-2 py-0.5 rounded text-[10px] font-mono bg-sky-500/20 text-sky-300 border border-sky-500/30 font-semibold uppercase">Server</span>`
      : `<span class="px-2 py-0.5 rounded text-[10px] font-mono bg-indigo-500/20 text-indigo-300 border border-indigo-500/30 font-semibold uppercase">Client</span>`;

    const endpointInfo = t.mode === 'server'
      ? `<span class="text-sky-300 font-mono">Port :${t.listen_port || 51830}</span>`
      : `<span class="text-indigo-300 font-mono">${escapeHtml(t.remote_endpoint || '(not set)')}</span>`;

    const compBadge = t.compression
      ? `<span class="px-1.5 py-0.5 rounded text-[10px] font-mono bg-emerald-500/20 text-emerald-300 border border-emerald-500/30 font-semibold" title="Adaptive LZ4 active">${t.compression_ratio || 'LZ4'}</span>`
      : `<span class="text-slate-500 text-[10px]">Off</span>`;

    const activePeer = t.connected && t.active_peer_endpoint
      ? `<span class="text-emerald-400 font-mono text-[11px]" title="Last authenticated packet: ${escapeHtml(t.last_handshake || 'just now')}; dropped: ${t.dropped_packets || 0}; auth failures: ${t.auth_failures || 0}; replay drops: ${t.replay_drops || 0}${t.last_error ? '; last error: ' + escapeHtml(t.last_error) : ''}">● ${escapeHtml(t.active_peer_endpoint)}</span>`
      : `<span class="text-slate-500 text-[11px]">${t.last_error ? 'Failed: ' + escapeHtml(t.last_error) : (!t.running ? (t.disabled ? 'Saved / disabled' : 'Stopped') : (t.mode === 'server' ? 'Waiting for peer...' : 'Connecting...'))}</span>`;

    const rawRx = formatBytes(t.rx_bytes || 0);
    const rawTx = formatBytes(t.tx_bytes || 0);
    const wireRx = formatBytes(t.wire_bytes_in || 0);
    const wireTx = formatBytes(t.wire_bytes_out || 0);
    const rate = aeroLiveRates.get(t.id);
    const id = encodeURIComponent(String(t.id || '')).replace(/'/g, '%27');

    tr.innerHTML = `
      <td class="py-2.5 px-3 text-center">${renderMikroTikFlag(t.connected, t.disabled)}</td>
      <td class="py-2.5 px-3 font-bold text-white font-mono flex items-center gap-1.5">
        <span>${escapeHtml(t.name)}</span>
        ${t.default_route ? '<span class="text-[9px] px-1 rounded bg-amber-500/20 text-amber-300 border border-amber-500/30">DEF</span>' : ''}
        <span class="text-slate-400 text-[10px]">v${t.protocol_version || 2}</span>
      </td>
      <td class="py-2.5 px-3">${modeBadge}</td>
      <td class="py-2.5 px-3 text-xs font-mono">${endpointInfo}</td>
      <td class="py-2.5 px-3 font-semibold text-emerald-400 font-mono">${escapeHtml(t.local_address || '-')}</td>
      <td class="py-2.5 px-3">${compBadge}</td>
      <td class="py-2.5 px-3">${activePeer}</td>
      <td class="py-2.5 px-3 font-mono text-[11px]">
        <span class="text-emerald-400">↓ ${rawRx}</span>
        <span class="text-cyan-400 ml-1">↑ ${rawTx}</span>
        ${rate ? `<div class="text-slate-400">↓ ${rate.rx.toFixed(2)} / ↑ ${rate.tx.toFixed(2)} Mbit/s</div>` : ''}
      </td>
      <td class="py-2.5 px-3 font-mono text-[11px]">
        <span class="text-slate-400">↓ ${wireRx}</span>
        <span class="text-slate-400 ml-1">↑ ${wireTx}</span>
      </td>
      <td class="py-2.5 px-3 text-slate-400 italic truncate max-w-[120px]" title="${escapeHtml(t.comment || '')}">${escapeHtml(t.comment || '-')}</td>
      <td class="py-2.5 px-3 text-right space-x-1.5 font-sans whitespace-nowrap">
        <button onclick="openAeroTUNHealth('${id}')" class="text-xs text-sky-400 hover:text-sky-300 font-medium">Health</button>
        ${t.running
          ? `<button onclick="stopAeroTUNTunnel('${t.id}')" class="text-xs text-amber-400 hover:text-amber-300 font-medium">Stop</button>`
          : `<button onclick="startAeroTUNTunnel('${t.id}')" class="text-xs text-emerald-400 hover:text-emerald-300 font-medium">Start</button>`
        }
        <button onclick="toggleAeroTUNState('${t.id}', ${!t.disabled})" class="text-xs ${t.disabled ? 'text-emerald-400' : 'text-slate-400'} hover:underline">${t.disabled ? 'Enable' : 'Disable'}</button>
        <button onclick="openEditAeroTUNModal('${t.id}')" class="text-xs text-slate-400 hover:text-white">Edit</button>
        <button onclick="deleteAeroTUN('${t.id}')" class="text-xs text-rose-400 hover:text-rose-300">Delete</button>
      </td>
    `;
    tbody.appendChild(tr);
  });
}

async function openAeroTUNHealth(encodedID) {
  state.aeroHealthSelected = decodeURIComponent(encodedID);
  const tunnel=(state.aerotunTunnels||[]).find(x=>x.id===state.aeroHealthSelected);
  let underlay='';try {underlay=new URL(`http://${tunnel?.remote_endpoint||tunnel?.active_peer_endpoint||''}`).hostname.replace(/^\[|\]$/g,'')} catch {}
  document.getElementById('aerotun-compare-host').value=underlay;
  document.getElementById('aerotun-compare-result').textContent='';
  document.getElementById('aerotun-health-result').textContent = '';
  document.getElementById('aerotun-health-panel').classList.remove('hidden');
  await refreshAeroTUNHealth();
  document.getElementById('aerotun-health-panel').scrollIntoView({behavior:'smooth',block:'nearest'});
}
function closeAeroTUNHealth() { aeroCompareCancel=true; state.aeroHealthSelected = ''; document.getElementById('aerotun-health-panel').classList.add('hidden'); }
async function refreshAeroTUNHealth() {
  const id=state.aeroHealthSelected,t=(state.aerotunTunnels||[]).find(x=>x.id===id);if(!id)return;
  if(!t){document.getElementById('aerotun-health-status').textContent='Tunnel no longer exists.';return}
  document.getElementById('aerotun-health-title').textContent=`Health: ${t.name}`;
  try {
    const response=await fetch(`${API_BASE}/vpn/aerotun/health`);if(!response.ok)throw new Error(await responseError(response));const data=await response.json();if(state.aeroHealthSelected!==id)return;
    const current=(data.states||[]).find(x=>x.tunnel_id===id);const status=current?.status||'unknown';const since=current?.since&&!current.since.startsWith('0001')?new Date(current.since).toLocaleString():'—';const rate=aeroLiveRates.get(id);
    const d=t.drop_breakdown;
    document.getElementById('aerotun-health-status').textContent=`Status: ${status} since ${since} · Backend: ${t.backend||'—'} · MTU: ${t.mtu||'—'} / configured ${t.configured_mtu||(!t.running?t.mtu:'—')||'—'} · Last authenticated packet: ${t.last_handshake||'never'} · Drops: ${t.dropped_packets||0}${d?` (outgoing invalid ${d.invalid_outgoing}, session ${d.missing_session}, send ${d.send_failure}, incoming invalid ${d.invalid_incoming}, source policy ${d.source_policy}, interface ${d.interface_write})`:''} · Authentication failures: ${t.auth_failures||0} · Replay drops: ${t.replay_drops||0}${Number.isFinite(data.service_cpu_percent)?` · Service CPU (all features): ${data.service_cpu_percent.toFixed(1)}% of one core`:''}${rate?` · RX/TX: ${rate.rx.toFixed(2)} / ${rate.tx.toFixed(2)} Mbit/s, ${rate.prx.toFixed(0)} / ${rate.ptx.toFixed(0)} packets/s`:''}${t.last_error?` · Last error: ${t.last_error}`:''}`;
    const events=(data.events||[]).filter(e=>e.tunnel_id===id).slice(0,100),node=document.getElementById('aerotun-health-history');node.replaceChildren();
    if(!events.length){node.textContent='No events recorded yet.';return}
    for(const e of events){const line=document.createElement('div');line.textContent=`${new Date(e.time).toLocaleString()} · ${e.type==='check'?'Check':(e.previous?`${e.previous} → ${e.status}${e.previous_duration_seconds?` (after ${Math.round(e.previous_duration_seconds)} s)`:''}`:e.status)}${e.detail?` · ${e.detail}`:''}`;node.appendChild(line)}
  } catch(e){document.getElementById('aerotun-health-history').textContent=`Health history unavailable: ${e.message}`}
}
async function runAeroTUNHealthCheck() {
  const id=state.aeroHealthSelected;if(!id)return;const button=document.getElementById('aerotun-health-check-btn'),output=document.getElementById('aerotun-health-result');button.disabled=true;output.textContent='Checking…';
  try {const response=await fetch(`${API_BASE}/vpn/aerotun/tunnels/${encodeURIComponent(id)}/health-check`,{method:'POST'});if(!response.ok)throw new Error(await responseError(response));const r=await response.json();if(state.aeroHealthSelected!==id)return;output.textContent=`Peer echo: ${r.reachability}${r.rtt_ms!=null?` · RTT ${r.rtt_upper_bound?'<':''}${r.rtt_ms} ms`:''} · ${r.mtu}-byte overlay probe: ${r.mtu_probe}. ${r.explanation}`;await refreshAeroTUNHealth()}
  catch(e){if(state.aeroHealthSelected===id)output.textContent=`Health check failed: ${e.message}`}
  finally {button.disabled=false}
}
let aeroCompareRunning=false, aeroCompareCancel=false;
function stopAeroTUNComparison() { aeroCompareCancel=true;document.getElementById('aerotun-compare-result').textContent+='\nStopping after the current test.'; }
async function runAeroTUNComparison() {
  if(aeroCompareRunning)return;
  const id=state.aeroHealthSelected,t=(state.aerotunTunnels||[]).find(x=>x.id===id),direct=document.getElementById('aerotun-compare-host').value.trim(),port=Number(document.getElementById('aerotun-compare-port').value),peer=(t?.peer_address||'').split('/')[0].trim();
  const output=document.getElementById('aerotun-compare-result'),button=document.getElementById('aerotun-compare-btn'),stop=document.getElementById('aerotun-compare-stop');
  if(!t?.connected||!peer||!direct||!Number.isInteger(port)||port<1||port>65535||peer===direct){output.textContent='A connected tunnel, peer IP, different direct server address and valid port are required.';return}
  if(peer.includes(':')||direct.includes(':')){output.textContent='This comparison currently supports IPv4 addresses or IPv4-resolvable hostnames.';return}
  aeroCompareRunning=true;aeroCompareCancel=false;button.disabled=true;stop.classList.remove('hidden');output.textContent='Starting. The direct address uses the system routing table.';
  const get=async(path,body)=>{const r=await fetch(`${API_BASE}${path}`,body?{method:'POST',headers:{'Content-Type':'application/json'},body:JSON.stringify(body)}:{});if(!r.ok)throw new Error(await responseError(r));return r.json()};
  const results=[];
  try {
    for(const [path,target,direction] of [['Tunnel',peer,'tx'],['Tunnel',peer,'rx'],['Direct',direct,'tx'],['Direct',direct,'rx']]) {
      if(aeroCompareCancel)break;
      if((await get('/tools/bwtest/status')).running)throw new Error('Another bandwidth test is running; comparison stopped.');
      output.textContent+=`\n${path} ${direction.toUpperCase()}: testing…`;
      const started=await get('/tools/bwtest/start',{target,port,protocol:'tcp',direction,bandwidth_limit:0,packet_size:1200,streams:2,duration:8}),session=started.session_id;let status,complete=false;
      for(let i=0;i<30;i++){await new Promise(resolve=>setTimeout(resolve,1000));status=await get('/tools/bwtest/status');if(status.session_id!==session)throw new Error('Bandwidth test session changed; comparison stopped.');if(!status.running){complete=true;break}}
      if(!complete)throw new Error('Timed out waiting for the bandwidth test.');if(status.error)throw new Error(`${path} ${direction.toUpperCase()}: ${status.error}`);
      const value=status.summary?.[direction==='tx'?'avg_tx_mbps':'avg_rx_mbps'];if(!Number.isFinite(value)||value<=0)throw new Error(`${path} ${direction.toUpperCase()}: no delivered data.`);
      results.push(`${path} ${direction.toUpperCase()}: ${value.toFixed(2)} Mbit/s`);output.textContent='Results:\n'+results.join('\n');
    }
    if(aeroCompareCancel)output.textContent+='\nComparison stopped.';
    else output.textContent+='\nDirect results are meaningful only if both addresses reach the same server over different routes.';
  } catch(e){output.textContent+=`\nComparison incomplete: ${e.message}`}
  finally {aeroCompareRunning=false;button.disabled=false;stop.classList.add('hidden')}
}

let aeroModalGeneration = 0;
let aeroIdentityDraft = '';
let aeroSaving = false;
let aeroPSKRequest = 0;

function discardAeroIdentityDraft(id) {
  if (id) fetch(`${API_BASE}/vpn/aerotun/identity-drafts/${encodeURIComponent(id)}`, {method:'DELETE'}).catch(() => {});
}

async function generateAeroTUNIdentity() {
  const generation = aeroModalGeneration;
  const retry = document.getElementById('aerotun-retry-identity');
  if (aeroIdentityDraft) { discardAeroIdentityDraft(aeroIdentityDraft); aeroIdentityDraft = ''; }
  retry.classList.add('hidden');
  document.getElementById('aerotun-modal-public').value = '';
  try {
    const res = await fetch(`${API_BASE}/vpn/aerotun/identity-drafts`, {method:'POST'});
    if (!res.ok) throw new Error(await responseError(res));
    const draft = await res.json();
    if (generation !== aeroModalGeneration) { discardAeroIdentityDraft(draft.draft_id); return; }
    aeroIdentityDraft = draft.draft_id;
    document.getElementById('aerotun-modal-public').value = draft.public_key;
    updateAeroTUNSetupHint();
  } catch (err) {
    if (generation !== aeroModalGeneration) return;
    retry.classList.remove('hidden');
    updateAeroTUNSetupHint();
    showToast('Identity Generation Failed', err.message, 'error');
  }
}

function onAeroTUNModeChange() {
  const mode = document.getElementById('aerotun-modal-mode').value;
  const endpointInput = document.getElementById('aerotun-modal-endpoint');
  const portInput = document.getElementById('aerotun-modal-port');

  if (mode === 'server') {
    if (!portInput.value) portInput.value = '51830';
    endpointInput.placeholder = 'Optional / learned roaming peer';
  } else {
    endpointInput.placeholder = 'vpn.example.com:51830 (required)';
    if (!portInput.value) portInput.value = '';
  }
}

function onAeroTUNPeerChange() {
  const peer = document.getElementById('aerotun-modal-peer');
  const allowed = document.getElementById('aerotun-modal-allowed');
  const previous = peer.dataset.allowedDefault || '';
  const host = peer.value.trim().split('/')[0];
  const next = host ? `${host}/${host.includes(':') ? 128 : 32}` : '';
  if (allowed.value.trim() === previous) allowed.value = next;
  peer.dataset.allowedDefault = next;
}

async function generateAeroTUNKey(automatic = false) {
  const generation = aeroModalGeneration, request = ++aeroPSKRequest;
  const input = document.getElementById('aerotun-modal-psk'), previous = input.value;
  try {
    const res = await fetch(`${API_BASE}/vpn/aerotun/genkey`);
    if (!res.ok) throw new Error(await responseError(res));
    const data = await res.json();
    if (generation !== aeroModalGeneration || request !== aeroPSKRequest || (automatic && input.value !== previous)) return;
    input.value = data.key;
    if (!automatic) showToast('Key Generated', 'Share this PSK securely with the peer before enabling', 'success');
  } catch (err) {
    if (generation === aeroModalGeneration && request === aeroPSKRequest) showToast('Key Generation Failed', err.message, 'error');
  }
}

function updateAeroTUNSetupHint() {
  const version = document.getElementById('aerotun-modal-protocol').value;
  const key = document.getElementById('aerotun-modal-public').value;
  const peer = document.getElementById('aerotun-modal-peerkey').value.trim();
  const hint = document.getElementById('aerotun-setup-hint');
  document.getElementById('aerotun-v3-fields').classList.toggle('hidden', version !== '3');
  if (!hint) return;
  hint.innerText = version !== '3' ? 'Legacy v2 uses a shared PSK. Both endpoints must use the same protocol.' : !key ? (document.getElementById('aerotun-modal-id').value ? 'Save this existing tunnel disabled to create its v3 identity, then exchange public keys.' : 'Generating the local identity. You can fill in the other settings while you wait.') : !peer ? 'Copy the local public key to the peer and paste its public key here. Use the same PSK on both endpoints; save disabled if the peer key is not ready.' : 'Check reciprocal addresses, allowed peer source prefixes and the shared PSK before enabling. Allowed prefixes do not create LAN routes.';
}

async function copyAeroTUNPublicKey() {
  const input = document.getElementById('aerotun-modal-public');
  if (!input.value) { showToast('Key Not Ready', 'Wait for the local identity or retry key generation.', 'info'); return; }
  try {
    await navigator.clipboard.writeText(input.value);
    showToast('Public Key Copied', 'Paste it into the other endpoint’s pinned peer key', 'success');
  } catch {
    input.focus(); input.select();
    showToast('Copy Public Key', 'Key selected; press Ctrl+C to copy', 'info');
  }
}

async function copyAeroTUNPSK() {
  const input = document.getElementById('aerotun-modal-psk');
  if (!input.value) { showToast('PSK Not Available', 'Generate or enter a PSK to copy it. Existing keys are not displayed.', 'info'); return; }
  try { await navigator.clipboard.writeText(input.value); showToast('PSK Copied', 'Share it securely with the peer.', 'success'); }
  catch { input.type = 'text'; input.focus(); input.select(); showToast('Copy PSK', 'Key selected; press Ctrl+C to copy.', 'info'); }
}

function openAddAeroTUNModal() {
  if (aeroSaving) return;
  aeroModalGeneration++; discardAeroIdentityDraft(aeroIdentityDraft); aeroIdentityDraft = '';
  const tunnels = state.aerotunTunnels || [];
  const usedNames = new Set(tunnels.map(t => t.name));
  const usedPorts = new Set(tunnels.map(t => Number(t.listen_port)));
  let index = 0; while (index < 256 && (usedNames.has(`aerotun${index}`) || usedPorts.has(51830 + index) || tunnels.some(t => (t.local_address || '').startsWith(`10.99.${index}.`)))) index++;
  if (index >= 256) index = 0;
  document.getElementById('aerotun-modal-title').innerText = 'Add AeroTUN Interface';
  document.getElementById('aerotun-modal-id').value = '';
 document.getElementById('aerotun-modal-protocol').value='3';
 document.getElementById('aerotun-modal-public').value='';
 document.getElementById('aerotun-modal-peerkey').value='';
 document.getElementById('aerotun-modal-allowed').value=`10.99.${index}.2/32`;
  document.getElementById('aerotun-modal-name').value = `aerotun${index}`;
  document.getElementById('aerotun-modal-mode').value = 'server';
  document.getElementById('aerotun-modal-port').value = 51830 + index;
  document.getElementById('aerotun-modal-endpoint').value = '';
  document.getElementById('aerotun-modal-local').value = `10.99.${index}.1/24`;
  document.getElementById('aerotun-modal-peer').value = `10.99.${index}.2/24`;
  document.getElementById('aerotun-modal-peer').dataset.allowedDefault = `10.99.${index}.2/32`;
  document.getElementById('aerotun-modal-psk').value = '';
  document.getElementById('aerotun-modal-mtu').value = '1420';
  document.getElementById('aerotun-modal-comment').value = '';
  document.getElementById('aerotun-modal-compression').checked = false;
  document.getElementById('aerotun-modal-defroute').checked = false;
  document.getElementById('aerotun-modal-disabled').checked = true;

  document.getElementById('aerotun-modal-psk').type = 'password';
  document.getElementById('aerotun-modal-psk').placeholder = 'Generate or enter the shared key';
  onAeroTUNModeChange();
  updateAeroTUNSetupHint();
  document.getElementById('aerotun-modal').classList.remove('hidden');
  generateAeroTUNKey(true);
  generateAeroTUNIdentity();
}

function openEditAeroTUNModal(id) {
  if (aeroSaving) return;
  const t = (state.aerotunTunnels || []).find(tun => tun.id === id);
  if (!t) return;
  aeroModalGeneration++; discardAeroIdentityDraft(aeroIdentityDraft); aeroIdentityDraft = '';
  document.getElementById('aerotun-retry-identity').classList.add('hidden');

  document.getElementById('aerotun-modal-title').innerText = `Edit AeroTUN Interface (${t.name})`;
  document.getElementById('aerotun-modal-id').value = t.id;
 document.getElementById('aerotun-modal-protocol').value=String(t.protocol_version || 2);
 document.getElementById('aerotun-modal-public').value=t.public_key || '';
 document.getElementById('aerotun-modal-peerkey').value=t.peer_public_key || '';
 document.getElementById('aerotun-modal-allowed').value=(t.allowed_ips || []).join(', ');
  document.getElementById('aerotun-modal-name').value = t.name;
  document.getElementById('aerotun-modal-mode').value = t.mode || 'server';
  document.getElementById('aerotun-modal-port').value = t.listen_port || '';
  document.getElementById('aerotun-modal-endpoint').value = t.remote_endpoint || '';
  document.getElementById('aerotun-modal-local').value = t.local_address || '';
  document.getElementById('aerotun-modal-peer').value = t.peer_address || '';
  const peerHost = (t.peer_address || '').split('/')[0];
  document.getElementById('aerotun-modal-peer').dataset.allowedDefault = peerHost ? `${peerHost}/${peerHost.includes(':') ? 128 : 32}` : '';
  document.getElementById('aerotun-modal-psk').value = '';
  document.getElementById('aerotun-modal-psk').type = 'password';
 document.getElementById('aerotun-modal-psk').placeholder = t.has_psk ? 'Leave blank to keep the existing key' : 'New random 256-bit PSK';
  document.getElementById('aerotun-modal-mtu').value = t.configured_mtu || t.mtu || 1420;
  document.getElementById('aerotun-modal-comment').value = t.comment || '';
  document.getElementById('aerotun-modal-compression').checked = !!t.compression;
  document.getElementById('aerotun-modal-defroute').checked = !!t.default_route;
  document.getElementById('aerotun-modal-disabled').checked = !!t.disabled;

  onAeroTUNModeChange();
  updateAeroTUNSetupHint();
  document.getElementById('aerotun-modal').classList.remove('hidden');
}

function closeAeroTUNModal() {
  if (aeroSaving) return;
  aeroModalGeneration++; discardAeroIdentityDraft(aeroIdentityDraft); aeroIdentityDraft = '';
  document.getElementById('aerotun-modal-psk').value = '';
  document.getElementById('aerotun-modal').classList.add('hidden');
}

async function submitSaveAeroTUN(e) {
  e.preventDefault();
  if (aeroSaving) return;
  const id = document.getElementById('aerotun-modal-id').value;
  const name = document.getElementById('aerotun-modal-name').value.trim();
  const mode = document.getElementById('aerotun-modal-mode').value;
  const port = parseInt(document.getElementById('aerotun-modal-port').value) || 0;
  const endpoint = document.getElementById('aerotun-modal-endpoint').value.trim();
  const local = document.getElementById('aerotun-modal-local').value.trim();
  const peer = document.getElementById('aerotun-modal-peer').value.trim();
  const psk = document.getElementById('aerotun-modal-psk').value.trim();
  const mtuValue = document.getElementById('aerotun-modal-mtu').value;
  const mtu = mtuValue === '' ? 1420 : Number(mtuValue);
  const comment = document.getElementById('aerotun-modal-comment').value.trim();
  const compression = document.getElementById('aerotun-modal-compression').checked;
  const defaultRoute = document.getElementById('aerotun-modal-defroute').checked;
  const disabled = document.getElementById('aerotun-modal-disabled').checked;

  if (mode === 'client' && !endpoint) {
    showToast('Validation Error', 'Remote endpoint (host:port) is required in client mode', 'error');
    return;
  }
  if (defaultRoute && (mode !== 'client' || !endpoint)) {
    showToast('Validation Error', 'Default route requires client mode and a fixed remote endpoint.', 'error');
    return;
  }
  if (!Number.isInteger(mtu) || mtu < 576 || mtu > 9000) {
    showToast('Validation Error', 'MTU must be between 576 and 9000.', 'error');
    return;
  }
  const version = parseInt(document.getElementById('aerotun-modal-protocol').value, 10);
  if (version === 3 && !id && !aeroIdentityDraft) {
    showToast('Local Key Not Ready', 'Wait for the local identity or retry key generation before saving.', 'error');
    return;
  }
  if (version === 3 && !document.getElementById('aerotun-modal-allowed').value.trim()) {
    showToast('Allowed Prefix Required', 'Enter at least one allowed peer source prefix, such as the peer tunnel IP /32.', 'error');
    document.getElementById('aerotun-modal-allowed').focus();
    return;
  }
  if (version === 3 && !disabled && !document.getElementById('aerotun-modal-peerkey').value.trim()) {
    showToast('Peer Key Required', 'Enter the peer public key, or save this tunnel disabled until it is available.', 'error');
    return;
  }
  if (!psk && !id) {
    showToast('Validation Error', 'Pre-shared key (PSK) is required', 'error');
    return;
  }

  aeroSaving = true;
  const submit = document.querySelector('#aerotun-modal button[type="submit"]');
  if (submit) submit.disabled = true;
  try {
    const res = await fetch(`${API_BASE}/vpn/aerotun/tunnels`, {
      method: 'POST',
      headers: { 'Content-Type': 'application/json' },
      body: JSON.stringify({
        protocol_version:parseInt(document.getElementById('aerotun-modal-protocol').value,10),
        identity_draft_id: version === 3 && !id ? aeroIdentityDraft : '',
        peer_public_key:document.getElementById('aerotun-modal-peerkey').value.trim(),
        allowed_ips:document.getElementById('aerotun-modal-allowed').value.split(',').map(s=>s.trim()).filter(Boolean),
        id,
        name,
        mode,
        listen_port: port,
        remote_endpoint: endpoint,
        local_address: local,
        peer_address: peer,
        psk,
        mtu,
        compression,
        default_route: defaultRoute,
        comment,
        disabled
      })
    });

    if (res.ok) {
      await res.json();
      if (version !== 3) discardAeroIdentityDraft(aeroIdentityDraft);
      aeroIdentityDraft = '';
      aeroSaving = false;
      closeAeroTUNModal();
      await loadAeroTUN(false);
      showToast('AeroTUN Saved', disabled ? 'Configuration saved; tunnel is disabled' : 'Configuration saved; waiting for authenticated peer traffic', 'success');
      fetchData(false);
    } else {
      const err = await responseError(res);
      if (err.includes('configuration saved but tunnel failed to start')) {
        aeroIdentityDraft = '';
        aeroSaving = false;
        closeAeroTUNModal();
        await loadAeroTUN(false);
        showToast('Saved, but not started', err, 'error');
      } else showToast('Error Saving Tunnel', err, 'error');
    }
  } catch (err) {
    showToast('Network Error', err.message, 'error');
  } finally {
    aeroSaving = false;
    if (submit) submit.disabled = false;
  }
}

async function startAeroTUNTunnel(id) {
  try {
    const res = await fetch(`${API_BASE}/vpn/aerotun/tunnels/${encodeURIComponent(id)}/start`, { method: 'POST' });
    if (res.ok) {
      showToast('AeroTUN Started', 'Interface started; connection is confirmed by authenticated peer traffic', 'info');
      loadAeroTUN(false);
      fetchData(false);
    } else {
      const err = await res.text();
      showToast('Failed to Start', err, 'error');
    }
  } catch (err) {
    showToast('Error', err.message, 'error');
  }
}

async function stopAeroTUNTunnel(id) {
  try {
    const res = await fetch(`${API_BASE}/vpn/aerotun/tunnels/${encodeURIComponent(id)}/stop`, { method: 'POST' });
    if (res.ok) {
      showToast('AeroTUN Stopped', 'Tunnel stopped', 'info');
      loadAeroTUN(false);
      fetchData(false);
    } else {
      const err = await res.text();
      showToast('Failed to Stop', err, 'error');
    }
  } catch (err) {
    showToast('Error', err.message, 'error');
  }
}

async function toggleAeroTUNState(id, disabled) {
  try {
    const res = await fetch(`${API_BASE}/vpn/aerotun/tunnels/${encodeURIComponent(id)}/state`, {
      method: 'POST',
      headers: { 'Content-Type': 'application/json' },
      body: JSON.stringify({ disabled })
    });
    if (res.ok) {
      showToast('State Updated', disabled ? 'Tunnel disabled' : 'Tunnel enabled', 'info');
      loadAeroTUN(false);
      fetchData(false);
    }
  } catch (err) {
    showToast('Error', err.message, 'error');
  }
}

async function deleteAeroTUN(id) {
  if (!confirm('Are you sure you want to delete this AeroTUN tunnel?')) return;
  try {
    const res = await fetch(`${API_BASE}/vpn/aerotun/tunnels/${encodeURIComponent(id)}`, { method: 'DELETE' });
    if (res.ok) {
      showToast('Deleted', 'AeroTUN tunnel removed', 'success');
      loadAeroTUN(false);
      fetchData(false);
    }
  } catch (err) {
    showToast('Error', err.message, 'error');
  }
}

// ======================== PPP Central Hub & Servers ========================
function switchPPPSubTab(tab) {
  state.pppSubTab = tab;
  const tabs = ['secrets', 'profiles', 'pppoe', 'pptp', 'l2tp', 'active'];
  tabs.forEach(t => {
    const panel = document.getElementById(`ppp-subtab-${t}`);
    const btn = document.getElementById(`ppp-subtab-btn-${t}`);
    if (panel) {
      if (t === tab) panel.classList.remove('hidden');
      else panel.classList.add('hidden');
    }
    if (btn) {
      if (t === tab) {
        btn.className = 'px-4 py-2.5 text-xs font-bold border-b-2 border-violet-500 text-white transition flex items-center gap-2 whitespace-nowrap';
      } else {
        btn.className = 'px-4 py-2.5 text-xs font-bold border-b-2 border-transparent text-slate-400 hover:text-slate-200 transition flex items-center gap-2 whitespace-nowrap';
      }
    }
  });

  const addBtn = document.getElementById('ppp-primary-add-btn');
  if (addBtn) {
    if (tab === 'secrets') addBtn.innerHTML = '<span>+ Add User (Secret)</span>';
    else if (tab === 'profiles') addBtn.innerHTML = '<span>+ Add Profile</span>';
    else if (tab === 'active') addBtn.innerHTML = '<span>Refresh Sessions</span>';
    else addBtn.innerHTML = '<span>Save Config</span>';
  }

  if (tab === 'active') loadPPPSessions();
}

function openCurrentPPPModal() {
  if (state.pppSubTab === 'secrets') openAddPPPSecretModal();
  else if (state.pppSubTab === 'profiles') openAddPPPProfileModal();
  else if (state.pppSubTab === 'active') loadPPPSessions();
  else if (state.pppSubTab === 'pppoe') document.querySelector('#ppp-subtab-pppoe form')?.requestSubmit();
  else if (state.pppSubTab === 'pptp') document.querySelector('#ppp-subtab-pptp form')?.requestSubmit();
  else if (state.pppSubTab === 'l2tp') document.querySelector('#ppp-subtab-l2tp form')?.requestSubmit();
}

async function loadPPP(populateDropdowns = true) {
  await Promise.all([
    loadPPPSecrets(),
    loadPPPProfiles(),
    loadPPPServers(),
    loadPPPSessions()
  ]);
}

async function loadPPPSecrets() {
  try {
    const res = await fetch(`${API_BASE}/vpn/ppp/secrets`);
    const data = await res.json();
    state.pppSecrets = Array.isArray(data) ? data : [];
    const b = document.getElementById('ppp-badge-secrets');
    if (b) b.innerText = state.pppSecrets.length;
    const b2 = document.getElementById('secrets-count-badge');
    if (b2) b2.innerText = `${state.pppSecrets.length} Users`;
    renderPPPSecrets();
  } catch (err) {
    console.error('Failed to load PPP secrets:', err);
  }
}

function renderPPPSecrets() {
  const tbody = document.getElementById('secrets-table-body');
  const empty = document.getElementById('secrets-empty');
  if (!tbody) return;
  tbody.innerHTML = '';

  const secrets = state.pppSecrets || [];
  if (secrets.length === 0) {
    empty?.classList.remove('hidden');
    return;
  }
  empty?.classList.add('hidden');

  secrets.forEach(s => {
    const tr = document.createElement('tr');
    tr.className = `hover:bg-slate-800/40 transition text-xs ${s.disabled ? 'opacity-50' : ''}`;
    tr.innerHTML = `
      <td class="py-2.5 px-3 text-center">${renderRuleFlag(s.disabled, !!s.comment)}</td>
      <td class="py-2.5 px-3 font-bold text-white font-mono">${s.name}</td>
      <td class="py-2.5 px-3 text-purple-300 font-mono font-semibold">${s.service}</td>
      <td class="py-2.5 px-3 text-amber-300 font-mono">${s.profile}</td>
      <td class="py-2.5 px-3 text-slate-400 font-mono">${s.local_address || '(profile)'}</td>
      <td class="py-2.5 px-3 text-cyan-400 font-mono font-bold">${s.remote_address || '(profile)'}</td>
      <td class="py-2.5 px-3 text-slate-400 italic truncate max-w-[120px]">${s.comment || '-'}</td>
      <td class="py-2.5 px-3 text-right space-x-1.5 font-sans whitespace-nowrap">
        <button onclick="togglePPPSecretState('${s.id}', ${!s.disabled})" class="text-xs ${s.disabled ? 'text-emerald-400' : 'text-slate-400'} hover:underline">${s.disabled ? 'Enable' : 'Disable'}</button>
        <button onclick="openEditPPPSecretModal('${s.id}')" class="text-xs text-slate-400 hover:text-white">Edit</button>
        <button onclick="deletePPPSecret('${s.id}')" class="text-xs text-rose-400 hover:text-rose-300">Delete</button>
      </td>
    `;
    tbody.appendChild(tr);
  });
}

async function loadPPPProfiles() {
  try {
    const res = await fetch(`${API_BASE}/vpn/ppp/profiles`);
    const data = await res.json();
    state.pppProfiles = Array.isArray(data) ? data : [];
    const b = document.getElementById('ppp-badge-profiles');
    if (b) b.innerText = state.pppProfiles.length;
    const b2 = document.getElementById('profiles-count-badge');
    if (b2) b2.innerText = `${state.pppProfiles.length} Profiles`;

    // Populate profile selects across modals
    const selects = ['secret-modal-profile', 'pppoe-server-profile', 'pptp-server-profile', 'l2tp-server-profile'];
    selects.forEach(sid => {
      const el = document.getElementById(sid);
      if (!el) return;
      const cur = el.value;
      el.innerHTML = '';
      state.pppProfiles.forEach(p => {
        const opt = document.createElement('option');
        opt.value = p.name;
        opt.innerText = `${p.name} (${p.remote_address})`;
        if (p.name === cur) opt.selected = true;
        el.appendChild(opt);
      });
    });

    renderPPPProfiles();
  } catch (err) {
    console.error('Failed to load PPP profiles:', err);
  }
}

function renderPPPProfiles() {
  const tbody = document.getElementById('profiles-table-body');
  if (!tbody) return;
  tbody.innerHTML = '';

  (state.pppProfiles || []).forEach(p => {
    const isDefault = p.name.startsWith('default');
    const tr = document.createElement('tr');
    tr.className = 'hover:bg-slate-800/40 transition text-xs font-mono';
    tr.innerHTML = `
      <td class="py-2.5 px-3 font-bold text-white">${p.name}</td>
      <td class="py-2.5 px-3 text-slate-300">${p.local_address}</td>
      <td class="py-2.5 px-3 text-cyan-400 font-bold">${p.remote_address}</td>
      <td class="py-2.5 px-3 text-slate-400">${p.dns_servers || '-'}</td>
      <td class="py-2.5 px-3 text-purple-300 font-semibold">${p.use_encryption}</td>
      <td class="py-2.5 px-3 text-center">${p.only_one ? '<span class="text-emerald-400">yes</span>' : '<span class="text-slate-500">no</span>'}</td>
      <td class="py-2.5 px-3 text-slate-400 italic">${p.comment || '-'}</td>
      <td class="py-2.5 px-3 text-right font-sans whitespace-nowrap">
        ${!isDefault ? `<button onclick="deletePPPProfile('${p.name}')" class="text-xs text-rose-400 hover:text-rose-300">Delete</button>` : `<span class="text-slate-600 text-[10px]">Built-in</span>`}
      </td>
    `;
    tbody.appendChild(tr);
  });
}

async function loadPPPServers() {
  try {
    const [pppoeRes, pptpRes, l2tpRes, ipsecRes] = await Promise.all([
      fetch(`${API_BASE}/vpn/servers/pppoe`),
      fetch(`${API_BASE}/vpn/servers/pptp`),
      fetch(`${API_BASE}/vpn/servers/l2tp`),
      fetch(`${API_BASE}/vpn/servers/ipsec`)
    ]);

    if (pppoeRes.ok) {
      state.pppoeServer = await pppoeRes.json();
      const s = state.pppoeServer;
      document.getElementById('pppoe-server-enabled').checked = !!s.enabled;
      document.getElementById('pppoe-server-name').value = s.service_name || 'debtik-pppoe';
      populateInterfaceSelect('pppoe-server-iface', s.interface || 'eth0');
      document.getElementById('pppoe-server-profile').value = s.default_profile || 'default';
      document.getElementById('pppoe-server-mtu').value = s.max_mtu || 1480;
      document.getElementById('pppoe-server-onesession').checked = !!s.one_session_per_host;
      const pill = document.getElementById('pppoe-server-status-pill');
      if (pill) {
        pill.innerText = s.running ? `ACTIVE (${s.active_sessions} sess)` : 'STOPPED';
        pill.className = s.running ? 'px-2 py-0.5 rounded text-[10px] font-mono font-semibold bg-blue-500/20 text-blue-300 border border-blue-500/40' : 'px-2 py-0.5 rounded text-[10px] font-mono font-semibold bg-slate-800 text-slate-400';
      }
      setDotBadge('ppp-badge-pppoe-state', s.running);
    }

    if (pptpRes.ok) {
      state.pptpServer = await pptpRes.json();
      const s = state.pptpServer;
      document.getElementById('pptp-server-enabled').checked = !!s.enabled;
      document.getElementById('pptp-server-port').value = s.port || 1723;
      document.getElementById('pptp-server-profile').value = s.default_profile || 'default-encryption';
      document.getElementById('pptp-server-mppe').checked = s.require_mppe !== false;
      const pill = document.getElementById('pptp-server-status-pill');
      if (pill) {
        pill.innerText = s.running ? `ACTIVE (${s.active_sessions} sess)` : 'STOPPED';
        pill.className = s.running ? 'px-2 py-0.5 rounded text-[10px] font-mono font-semibold bg-purple-500/20 text-purple-300 border border-purple-500/40' : 'px-2 py-0.5 rounded text-[10px] font-mono font-semibold bg-slate-800 text-slate-400';
      }
      setDotBadge('ppp-badge-pptp-state', s.running);
    }

    if (l2tpRes.ok) {
      state.l2tpServer = await l2tpRes.json();
      const s = state.l2tpServer;
      document.getElementById('l2tp-server-enabled').checked = !!s.enabled;
      document.getElementById('l2tp-server-port').value = s.port || 1701;
      document.getElementById('l2tp-server-profile').value = s.default_profile || 'default';
      document.getElementById('l2tp-server-useipsec').value = s.use_ipsec || 'no';
      document.getElementById('l2tp-server-ipsecsecret').value = s.ipsec_secret || '';
      const pill = document.getElementById('l2tp-server-status-pill');
      if (pill) {
        pill.innerText = s.running ? `ACTIVE (${s.active_sessions} sess)` : 'STOPPED';
        pill.className = s.running ? 'px-2 py-0.5 rounded text-[10px] font-mono font-semibold bg-cyan-500/20 text-cyan-300 border border-cyan-500/40' : 'px-2 py-0.5 rounded text-[10px] font-mono font-semibold bg-slate-800 text-slate-400';
      }
      setDotBadge('ppp-badge-l2tp-state', s.running);
    }

    if (ipsecRes.ok) {
      state.ipsecServer = await ipsecRes.json();
      const s = state.ipsecServer;
      const modalEn = document.getElementById('modal-ipsec-server-enabled');
      if (modalEn) modalEn.checked = !!s.enabled;
      const modalPsk = document.getElementById('modal-ipsec-server-psk');
      if (modalPsk) modalPsk.value = s.preshared_key || '';
      const modalPool = document.getElementById('modal-ipsec-server-pool');
      if (modalPool) modalPool.value = s.pool_address || '10.10.30.0/24';
      const modalDns = document.getElementById('modal-ipsec-server-dns');
      if (modalDns) modalDns.value = s.dns_servers || '1.1.1.1,8.8.8.8';
      const modalSubnet = document.getElementById('modal-ipsec-server-subnet');
      if (modalSubnet) modalSubnet.value = s.local_subnet || '0.0.0.0/0';
      const pill = document.getElementById('modal-ipsec-server-status');
      if (pill) {
        pill.innerText = s.running ? 'ACTIVE RESPONDER' : 'STOPPED';
        pill.className = s.running ? 'px-2 py-0.5 rounded text-[10px] font-mono font-semibold bg-amber-500/20 text-amber-300 border border-amber-500/40' : 'px-2 py-0.5 rounded text-[10px] font-mono font-semibold bg-slate-800 text-slate-400';
      }
    }
  } catch (err) {
    console.error('Failed to load VPN servers:', err);
  }
}

async function loadPPPSessions() {
  try {
    const res = await fetch(`${API_BASE}/vpn/ppp/active`);
    const data = await res.json();
    state.pppActiveSessions = Array.isArray(data) ? data : [];
    const b = document.getElementById('ppp-badge-active');
    if (b) b.innerText = state.pppActiveSessions.length;
    const sideB = document.getElementById('badge-ppp-sessions');
    if (sideB) sideB.innerText = state.pppActiveSessions.length;
    renderPPPSessions();
  } catch (err) {
    console.error('Failed to load active PPP sessions:', err);
  }
}

function renderPPPSessions() {
  const tbody = document.getElementById('active-ppp-table-body');
  const empty = document.getElementById('active-ppp-empty');
  if (!tbody) return;
  tbody.innerHTML = '';

  const list = state.pppActiveSessions || [];
  if (list.length === 0) {
    empty?.classList.remove('hidden');
    return;
  }
  empty?.classList.add('hidden');

  list.forEach(s => {
    const tr = document.createElement('tr');
    tr.className = 'hover:bg-slate-800/40 transition text-xs font-mono';
    tr.innerHTML = `
      <td class="py-2.5 px-3 font-bold text-white">${s.interface}</td>
      <td class="py-2.5 px-3 font-semibold text-violet-300">${s.username}</td>
      <td class="py-2.5 px-3 text-cyan-400 uppercase">${s.service}</td>
      <td class="py-2.5 px-3 text-emerald-400 font-bold">${s.address || '-'}</td>
      <td class="py-2.5 px-3 text-slate-400">${s.uptime}</td>
      <td class="py-2.5 px-3 text-[11px]">
        <span class="text-emerald-400">↓ ${s.rx_human || '0 B'}</span>
        <span class="text-cyan-400 ml-1">↑ ${s.tx_human || '0 B'}</span>
      </td>
      <td class="py-2.5 px-3 text-right font-sans">
        <button onclick="disconnectPPPSession('${s.interface}')" class="text-xs text-rose-400 hover:text-rose-300">Disconnect</button>
      </td>
    `;
    tbody.appendChild(tr);
  });
}

async function disconnectPPPSession(iface) {
  if (!confirm(`Disconnect session ${iface}?`)) return;
  try {
    const res = await fetch(`${API_BASE}/vpn/ppp/active/${encodeURIComponent(iface)}`, { method: 'DELETE' });
    if (res.ok) {
      showToast('Disconnected', `Session ${iface} terminated`, 'info');
      loadPPPSessions();
    }
  } catch (err) {
    showToast('Error', err.message, 'error');
  }
}

// PPP Secret Modal handlers
function openAddPPPSecretModal() {
  document.getElementById('secret-modal-title').innerText = 'Add PPP Secret';
  document.getElementById('secret-modal-id').value = '';
  document.getElementById('secret-modal-name').value = '';
  document.getElementById('secret-modal-password').value = '';
  document.getElementById('secret-modal-service').value = 'any';
  document.getElementById('secret-modal-profile').value = 'default';
  document.getElementById('secret-modal-local').value = '';
  document.getElementById('secret-modal-remote').value = '';
  document.getElementById('secret-modal-comment').value = '';
  document.getElementById('secret-modal-disabled').checked = false;
  document.getElementById('ppp-secret-modal').classList.remove('hidden');
}

function openEditPPPSecretModal(id) {
  const s = (state.pppSecrets || []).find(sec => sec.id === id);
  if (!s) return;
  document.getElementById('secret-modal-title').innerText = `Edit PPP Secret (${s.name})`;
  document.getElementById('secret-modal-id').value = s.id;
  document.getElementById('secret-modal-name').value = s.name;
  document.getElementById('secret-modal-password').value = s.password;
  document.getElementById('secret-modal-service').value = s.service || 'any';
  document.getElementById('secret-modal-profile').value = s.profile || 'default';
  document.getElementById('secret-modal-local').value = s.local_address || '';
  document.getElementById('secret-modal-remote').value = s.remote_address || '';
  document.getElementById('secret-modal-comment').value = s.comment || '';
  document.getElementById('secret-modal-disabled').checked = !!s.disabled;
  document.getElementById('ppp-secret-modal').classList.remove('hidden');
}

function closePPPSecretModal() {
  document.getElementById('ppp-secret-modal').classList.add('hidden');
}

async function submitSavePPPSecret(e) {
  e.preventDefault();
  const id = document.getElementById('secret-modal-id').value;
  const name = document.getElementById('secret-modal-name').value.trim();
  const password = document.getElementById('secret-modal-password').value.trim();
  const service = document.getElementById('secret-modal-service').value;
  const profile = document.getElementById('secret-modal-profile').value;
  const local = document.getElementById('secret-modal-local').value.trim();
  const remote = document.getElementById('secret-modal-remote').value.trim();
  const comment = document.getElementById('secret-modal-comment').value.trim();
  const disabled = document.getElementById('secret-modal-disabled').checked;

  try {
    const res = await fetch(`${API_BASE}/vpn/ppp/secrets`, {
      method: 'POST',
      headers: { 'Content-Type': 'application/json' },
      body: JSON.stringify({
        id,
        name,
        password,
        service,
        profile,
        local_address: local,
        remote_address: remote,
        comment,
        disabled
      })
    });
    if (res.ok) {
      showToast('Secret Saved', `User ${name} saved to PPP database`, 'success');
      closePPPSecretModal();
      loadPPPSecrets();
    } else {
      const err = await res.json();
      showToast('Error', err.message, 'error');
    }
  } catch (err) {
    showToast('Error', err.message, 'error');
  }
}

async function togglePPPSecretState(id, disabled) {
  try {
    const res = await fetch(`${API_BASE}/vpn/ppp/secrets/${encodeURIComponent(id)}/state`, {
      method: 'POST',
      headers: { 'Content-Type': 'application/json' },
      body: JSON.stringify({ disabled })
    });
    if (res.ok) {
      showToast(disabled ? 'Disabled' : 'Enabled', 'Secret user state updated', 'info');
      loadPPPSecrets();
    }
  } catch (err) {
    showToast('Error', err.message, 'error');
  }
}

async function deletePPPSecret(id) {
  if (!confirm('Are you sure you want to delete this secret account?')) return;
  try {
    const res = await fetch(`${API_BASE}/vpn/ppp/secrets/${encodeURIComponent(id)}`, { method: 'DELETE' });
    if (res.ok) {
      showToast('Deleted', 'Secret account removed', 'success');
      loadPPPSecrets();
    }
  } catch (err) {
    showToast('Error', err.message, 'error');
  }
}

// PPP Profile Modal handlers
function openAddPPPProfileModal() {
  document.getElementById('profile-modal-name').value = '';
  document.getElementById('profile-modal-local').value = '10.10.10.1';
  document.getElementById('profile-modal-remote').value = '10.10.10.10-10.10.10.50';
  document.getElementById('profile-modal-dns').value = '1.1.1.1,8.8.8.8';
  document.getElementById('profile-modal-encryption').value = 'required';
  document.getElementById('profile-modal-onlyone').checked = true;
  document.getElementById('profile-modal-comment').value = '';
  document.getElementById('ppp-profile-modal').classList.remove('hidden');
}

function closePPPProfileModal() {
  document.getElementById('ppp-profile-modal').classList.add('hidden');
}

async function submitSavePPPProfile(e) {
  e.preventDefault();
  const name = document.getElementById('profile-modal-name').value.trim();
  const local = document.getElementById('profile-modal-local').value.trim();
  const remote = document.getElementById('profile-modal-remote').value.trim();
  const dns = document.getElementById('profile-modal-dns').value.trim();
  const enc = document.getElementById('profile-modal-encryption').value;
  const onlyone = document.getElementById('profile-modal-onlyone').checked;
  const comment = document.getElementById('profile-modal-comment').value.trim();

  try {
    const res = await fetch(`${API_BASE}/vpn/ppp/profiles`, {
      method: 'POST',
      headers: { 'Content-Type': 'application/json' },
      body: JSON.stringify({
        id: name,
        name,
        local_address: local,
        remote_address: remote,
        dns_servers: dns,
        use_encryption: enc,
        only_one: onlyone,
        comment
      })
    });
    if (res.ok) {
      showToast('Profile Saved', `PPP profile ${name} created`, 'success');
      closePPPProfileModal();
      loadPPPProfiles();
    } else {
      const err = await res.json();
      showToast('Error', err.message, 'error');
    }
  } catch (err) {
    showToast('Error', err.message, 'error');
  }
}

async function deletePPPProfile(name) {
  if (!confirm(`Delete PPP profile ${name}?`)) return;
  try {
    const res = await fetch(`${API_BASE}/vpn/ppp/profiles/${encodeURIComponent(name)}`, { method: 'DELETE' });
    if (res.ok) {
      showToast('Deleted', 'Profile removed', 'success');
      loadPPPProfiles();
    } else {
      const err = await res.json();
      showToast('Error', err.message, 'error');
    }
  } catch (err) {
    showToast('Error', err.message, 'error');
  }
}

// Server Config submissions
async function savePPPoEServerConfig(e) {
  e.preventDefault();
  const enabled = document.getElementById('pppoe-server-enabled').checked;
  const name = document.getElementById('pppoe-server-name').value.trim();
  const iface = document.getElementById('pppoe-server-iface').value;
  const profile = document.getElementById('pppoe-server-profile').value;
  const mtu = parseInt(document.getElementById('pppoe-server-mtu').value) || 1480;
  const onesession = document.getElementById('pppoe-server-onesession').checked;

  try {
    const res = await fetch(`${API_BASE}/vpn/servers/pppoe`, {
      method: 'POST',
      headers: { 'Content-Type': 'application/json' },
      body: JSON.stringify({
        enabled,
        service_name: name,
        interface: iface,
        default_profile: profile,
        max_mtu: mtu,
        max_mru: mtu,
        one_session_per_host: onesession
      })
    });
    if (res.ok) {
      showToast('PPPoE Server', enabled ? 'PPPoE Server started' : 'PPPoE Server stopped', 'success');
      loadPPPServers();
      fetchData(false);
    } else {
      const err = await res.json();
      showToast('Error', err.message, 'error');
    }
  } catch (err) {
    showToast('Error', err.message, 'error');
  }
}

async function savePPTPServerConfig(e) {
  e.preventDefault();
  const enabled = document.getElementById('pptp-server-enabled').checked;
  const port = parseInt(document.getElementById('pptp-server-port').value) || 1723;
  const profile = document.getElementById('pptp-server-profile').value;
  const mppe = document.getElementById('pptp-server-mppe').checked;

  try {
    const res = await fetch(`${API_BASE}/vpn/servers/pptp`, {
      method: 'POST',
      headers: { 'Content-Type': 'application/json' },
      body: JSON.stringify({
        enabled,
        port,
        default_profile: profile,
        require_mppe: mppe
      })
    });
    if (res.ok) {
      showToast('PPTP Server', enabled ? 'PPTP Server started' : 'PPTP Server stopped', 'success');
      loadPPPServers();
      fetchData(false);
    } else {
      const err = await res.json();
      showToast('Error', err.message, 'error');
    }
  } catch (err) {
    showToast('Error', err.message, 'error');
  }
}

async function saveL2TPServerConfig(e) {
  e.preventDefault();
  const enabled = document.getElementById('l2tp-server-enabled').checked;
  const port = parseInt(document.getElementById('l2tp-server-port').value) || 1701;
  const profile = document.getElementById('l2tp-server-profile').value;
  const useipsec = document.getElementById('l2tp-server-useipsec').value;
  const psk = document.getElementById('l2tp-server-ipsecsecret').value.trim();

  try {
    const res = await fetch(`${API_BASE}/vpn/servers/l2tp`, {
      method: 'POST',
      headers: { 'Content-Type': 'application/json' },
      body: JSON.stringify({
        enabled,
        port,
        default_profile: profile,
        use_ipsec: useipsec,
        ipsec_secret: psk
      })
    });
    if (res.ok) {
      showToast('L2TP Server', enabled ? 'L2TP Server started' : 'L2TP Server stopped', 'success');
      loadPPPServers();
      fetchData(false);
    } else {
      const err = await res.json();
      showToast('Error', err.message, 'error');
    }
  } catch (err) {
    showToast('Error', err.message, 'error');
  }
}

// IPSec Server Modal
function openIPSecServerModal() {
  loadPPPServers();
  document.getElementById('ipsec-server-modal').classList.remove('hidden');
}

function closeIPSecServerModal() {
  document.getElementById('ipsec-server-modal').classList.add('hidden');
}

async function submitSaveIPSecServer(e) {
  e.preventDefault();
  const enabled = document.getElementById('modal-ipsec-server-enabled').checked;
  const psk = document.getElementById('modal-ipsec-server-psk').value.trim();
  const pool = document.getElementById('modal-ipsec-server-pool').value.trim();
  const dns = document.getElementById('modal-ipsec-server-dns').value.trim();
  const subnet = document.getElementById('modal-ipsec-server-subnet').value.trim();

  try {
    const res = await fetch(`${API_BASE}/vpn/servers/ipsec`, {
      method: 'POST',
      headers: { 'Content-Type': 'application/json' },
      body: JSON.stringify({
        enabled,
        preshared_key: psk,
        pool_address: pool,
        dns_servers: dns,
        local_subnet: subnet
      })
    });
    if (res.ok) {
      showToast('IPSec Server', enabled ? 'IKEv2 Roadwarrior responder active' : 'IPSec Server stopped', 'success');
      closeIPSecServerModal();
      loadPPPServers();
      fetchData(false);
    } else {
      const err = await res.json();
      showToast('Error', err.message, 'error');
    }
  } catch (err) {
    showToast('Error', err.message, 'error');
  }
}

// WireGuard Client Config Viewer
let currentWGClientConf = '';

async function openWGClientConfModal(iface, clientIP) {
  try {
    const res = await fetch(`${API_BASE}/vpn/wireguard/client-config`, {
      method: 'POST',
      headers: { 'Content-Type': 'application/json' },
      body: JSON.stringify({
        interface: iface,
        address: clientIP || '10.10.0.2/32',
        dns: '1.1.1.1, 8.8.8.8'
      })
    });
    if (res.ok) {
      const data = await res.json();
      currentWGClientConf = data.config;
      document.getElementById('wg-client-conf-text').value = currentWGClientConf;
      document.getElementById('wg-client-conf-modal').classList.remove('hidden');
    } else {
      const err = await res.json();
      showToast('Error', err.message, 'error');
    }
  } catch (err) {
    showToast('Error', err.message, 'error');
  }
}

function closeWGClientConfModal() {
  document.getElementById('wg-client-conf-modal').classList.add('hidden');
}

function copyWGClientConf() {
  if (!currentWGClientConf) return;
  copyToClipboard(currentWGClientConf, 'WireGuard Client Profile');
}

function downloadWGClientConf() {
  if (!currentWGClientConf) return;
  const blob = new Blob([currentWGClientConf], { type: 'text/plain;charset=utf-8' });
  const a = document.createElement('a');
  a.href = URL.createObjectURL(blob);
  a.download = 'wireguard-client.conf';
  document.body.appendChild(a);
  a.click();
  document.body.removeChild(a);
  showToast('Downloaded', 'wireguard-client.conf saved', 'success');
}

// =========================================================================
// DYNAMIC ROUTING (FRRouting BGP & OSPFv2)
// =========================================================================

state.activeDynSubTab = 'bgp-peers';
state.activeBgpSubTab = 'bgp-peers';
state.activeOspfTab = 'instances';
state.bgpInstance = null;
state.bgpPeers = [];
state.bgpNets = [];
state.bgpRoutes = [];
state.ospfInstance = null;
state.ospfInstances = [];
state.ospfAreas = [];
state.ospfAreaRanges = [];
state.ospfTemplates = [];
state.ospfLiveInterfaces = [];
state.ospfStaticNbrs = [];
state.ospfNeighbors = [];
state.ospfLSA = [];
state.ospfRoutes = [];
state.selectedOspfRow = {
  instances: null,
  areas: null,
  'area-ranges': null,
  templates: null,
  interfaces: null,
  'static-nbrs': null,
  neighbors: null,
  lsa: null,
};
state.ospfSort = {
  instances: { col: 'name', asc: true },
  areas: { col: 'name', asc: true },
  ranges: { col: 'area', asc: true },
  templates: { col: 'interfaces', asc: true },
  live_ifaces: { col: 'interface', asc: true },
  snbrs: { col: 'address', asc: true },
  neighbors: { col: 'address', asc: true },
  lsa: { col: 'instance', asc: true },
};

function switchBgpSubTab(subTab) {
  state.activeBgpSubTab = subTab;
  const tabs = ['bgp-peers', 'bgp-nets', 'bgp-routes'];
  tabs.forEach(t => {
    const el = document.getElementById(`dyn-subtab-${t}`);
    const btn = document.getElementById(`bgp-subtab-btn-${t}`);
    if (el) el.classList.toggle('hidden', t !== subTab);
    if (btn) {
      if (t === subTab) {
        btn.className = 'px-4 py-2.5 text-xs font-bold border-b-2 border-purple-500 text-white transition flex items-center gap-2 whitespace-nowrap';
      } else {
        btn.className = 'px-4 py-2.5 text-xs font-bold border-b-2 border-transparent text-slate-400 hover:text-slate-200 transition flex items-center gap-2 whitespace-nowrap';
      }
    }
  });
}

function switchOspfTab(tabName) {
  state.activeOspfTab = tabName;
  const tabs = ['instances', 'areas', 'area-ranges', 'templates', 'interfaces', 'static-nbrs', 'neighbors', 'lsa'];
  tabs.forEach(t => {
    const pane = document.getElementById(`ospf-pane-${t}`);
    const btn = document.getElementById(`ospf-tab-btn-${t}`);
    if (pane) pane.classList.toggle('hidden', t !== tabName);
    if (btn) {
      if (t === tabName) {
        btn.className = 'px-3 py-2 text-xs font-semibold border-b-2 border-sky-500 text-white transition flex items-center gap-1.5 whitespace-nowrap';
      } else {
        btn.className = 'px-3 py-2 text-xs font-semibold border-b-2 border-transparent text-slate-400 hover:text-white transition flex items-center gap-1.5 whitespace-nowrap';
      }
    }
  });
}

function switchOspfSubTab(tab) {
  // Legacy alias
  if (tab === 'ospf-ifaces') switchOspfTab('templates');
  else if (tab === 'ospf-areas') switchOspfTab('areas');
  else if (tab === 'ospf-nbrs') switchOspfTab('neighbors');
  else switchOspfTab('instances');
}

function switchDynSubTab(subTab) {
  if (subTab.startsWith('bgp')) {
    if (state.activeTab !== 'bgp') navigate('bgp');
    switchBgpSubTab(subTab);
  } else if (subTab.startsWith('ospf')) {
    if (state.activeTab !== 'ospf') navigate('ospf');
    switchOspfTab('instances');
  }
}

async function loadDynamicRouting(showToastMsg = false) {
  try {
    const fetchSafeJson = async (url) => {
      try {
        const r = await fetch(url);
        return r.ok ? await r.json() : null;
      } catch (e) {
        return null;
      }
    };

    const [
      sum, bgpInst, bgpPeers, bgpNets, bgpRoutes,
      ospfInsts, ospfAreas, ospfRanges, ospfTemplates, ospfLiveIfaces, ospfStaticNbrs, ospfNbrs, ospfLsa, filters,
      selectRules, commLists, asLists
    ] = await Promise.all([
      fetchSafeJson(`${API_BASE}/routing/dynamic/summary`),
      fetchSafeJson(`${API_BASE}/routing/bgp/instance`),
      fetchSafeJson(`${API_BASE}/routing/bgp/peers`),
      fetchSafeJson(`${API_BASE}/routing/bgp/networks`),
      fetchSafeJson(`${API_BASE}/routing/bgp/routes`),
      fetchSafeJson(`${API_BASE}/routing/ospf/instances`),
      fetchSafeJson(`${API_BASE}/routing/ospf/areas`),
      fetchSafeJson(`${API_BASE}/routing/ospf/area-ranges`),
      fetchSafeJson(`${API_BASE}/routing/ospf/templates`),
      fetchSafeJson(`${API_BASE}/routing/ospf/interfaces-live`),
      fetchSafeJson(`${API_BASE}/routing/ospf/static-neighbors`),
      fetchSafeJson(`${API_BASE}/routing/ospf/neighbors`),
      fetchSafeJson(`${API_BASE}/routing/ospf/lsa`),
      fetchSafeJson(`${API_BASE}/routing/filters`),
      fetchSafeJson(`${API_BASE}/routing/filters/community-lists`),
      fetchSafeJson(`${API_BASE}/routing/filters/as-lists`)
    ]);

    if (sum) state.dynSummary = sum;
    if (bgpInst) state.bgpInstance = bgpInst;
    if (bgpPeers) state.bgpPeers = bgpPeers;
    if (bgpNets) state.bgpNets = bgpNets;
    if (bgpRoutes) state.bgpRoutes = bgpRoutes;
    if (ospfInsts) state.ospfInstances = ospfInsts;
    if (ospfAreas) state.ospfAreas = ospfAreas;
    if (ospfRanges) state.ospfAreaRanges = ospfRanges;
    if (ospfTemplates) state.ospfTemplates = ospfTemplates;
    if (ospfLiveIfaces) state.ospfLiveInterfaces = ospfLiveIfaces;
    if (ospfStaticNbrs) state.ospfStaticNbrs = ospfStaticNbrs;
    if (ospfNbrs) state.ospfNeighbors = ospfNbrs;
    if (ospfLsa) state.ospfLSA = ospfLsa;
    if (filters) state.routingFilters = filters;
    if (commLists) state.routingCommunityLists = commLists;
    if (asLists) state.routingASLists = asLists;

    try { renderBgpStatusPill(); } catch(e) { console.error('renderBgpStatusPill error:', e); }
    try { renderBgpPeers(); } catch(e) { console.error('renderBgpPeers error:', e); }
    try { renderBgpNetworks(); } catch(e) { console.error('renderBgpNetworks error:', e); }
    try { renderBgpRoutes(); } catch(e) { console.error('renderBgpRoutes error:', e); }

    try { renderOspfInstances(); } catch(e) { console.error('renderOspfInstances error:', e); }
    try { renderOspfAreas(); } catch(e) { console.error('renderOspfAreas error:', e); }
    try { renderOspfAreaRanges(); } catch(e) { console.error('renderOspfAreaRanges error:', e); }
    try { renderOspfTemplates(); } catch(e) { console.error('renderOspfTemplates error:', e); }
    try { renderOspfLiveInterfaces(); } catch(e) { console.error('renderOspfLiveInterfaces error:', e); }
    try { renderOspfStaticNbrs(); } catch(e) { console.error('renderOspfStaticNbrs error:', e); }
    try { renderOspfNeighbors(); } catch(e) { console.error('renderOspfNeighbors error:', e); }
    try { renderOspfLSA(); } catch(e) { console.error('renderOspfLSA error:', e); }

    try { renderRoutingFilters(); } catch(e) { console.error('renderRoutingFilters error:', e); }
    try { updateBadges(); } catch(e) { console.error('updateBadges error:', e); }

    if (showToastMsg) showToast('Refreshed', 'Dynamic routing telemetry updated', 'info');
  } catch (err) {
    console.error('Failed to load dynamic routing:', err);
    if (showToastMsg) showToast('Notice', 'Unable to refresh dynamic routing telemetry', 'warning');
  }
}

async function loadOspfAll() {
  await loadDynamicRouting(true);
}

function renderBgpStatusPill() {
  const pills = document.querySelectorAll('.bgp-live-status-pill');
  pills.forEach(pill => {
  const inst = state.bgpInstance;
  if (!inst || !inst.enabled) {
    pill.className = 'bgp-live-status-pill text-[10px] px-2 py-0.5 rounded font-mono bg-slate-800 text-slate-400 border border-slate-700';
    pill.innerText = 'BGP DISABLED';
  } else if (inst.running) {
    pill.className = 'bgp-live-status-pill text-[10px] px-2 py-0.5 rounded font-mono bg-purple-950 text-purple-300 border border-purple-800/60 font-semibold';
    pill.innerText = `BGP ACTIVE (AS ${inst.as})`;
  } else {
    pill.className = 'bgp-live-status-pill text-[10px] px-2 py-0.5 rounded font-mono bg-amber-950 text-amber-300 border border-amber-800/60 font-semibold';
    pill.innerText = 'BGP STARTING...';
  }
  });
}

function renderBgpPeers() {
  const tbody = document.getElementById('bgp-peers-table-body');
  if (!tbody) return;
  const empty = document.getElementById('bgp-peers-empty');
  const countBadge = document.getElementById('bgp-peers-count-badge');
  const navBadge = document.getElementById('dyn-badge-bgp-peers');

  const peers = state.bgpPeers || [];
  if (countBadge) countBadge.innerText = `${peers.length} Peers`;
  if (navBadge) navBadge.innerText = peers.length;

  if (peers.length === 0) {
    tbody.innerHTML = '';
    if (empty) empty.classList.remove('hidden');
    return;
  }
  if (empty) empty.classList.add('hidden');

  const sig = peers.map(p => `${p.name}:${p.state}:${p.uptime}:${p.prefix_received}:${p.prefix_sent}:${p.disabled}`).join(';');
  if (tbody.dataset.sig === sig) return;
  tbody.dataset.sig = sig;

  tbody.innerHTML = peers.map(p => {
    let flagA = !p.disabled ? '<span class="text-cyan-400 font-bold" title="Active">A</span>' : '';
    let flagE = p.state === 'Established' ? '<span class="text-emerald-400 font-bold ml-1" title="Established">E</span>' : '';
    let flagX = p.disabled ? '<span class="text-rose-400 font-bold ml-1" title="Disabled">X</span>' : '';

    let stateBadge = '';
    if (p.disabled) {
      stateBadge = '<span class="px-2 py-0.5 rounded-full text-[10px] font-sans font-medium bg-slate-800 text-slate-400 border border-slate-700">Disabled</span>';
    } else if (p.state === 'Established') {
      stateBadge = '<span class="px-2 py-0.5 rounded-full text-[10px] font-sans font-medium bg-emerald-500/10 text-emerald-400 border border-emerald-500/20">Established</span>';
    } else if (p.state === 'Connect' || p.state === 'Active') {
      stateBadge = `<span class="px-2 py-0.5 rounded-full text-[10px] font-sans font-medium bg-amber-500/10 text-amber-400 border border-amber-500/20">${p.state}</span>`;
    } else {
      stateBadge = `<span class="px-2 py-0.5 rounded-full text-[10px] font-sans font-medium bg-slate-800 text-slate-400 border border-slate-700">${p.state || 'Idle'}</span>`;
    }

    return `
      <tr class="hover:bg-slate-800/40 transition">
        <td class="py-2.5 px-3 text-center tracking-wider">${flagA}${flagE}${flagX}</td>
        <td class="py-2.5 px-3 font-semibold text-white">${escapeHtml(p.name)}</td>
        <td class="py-2.5 px-3 text-purple-300 font-bold">${escapeHtml(p.remote_address)}</td>
        <td class="py-2.5 px-3">
          <div class="font-bold text-slate-200">AS ${p.remote_as}</div>
          ${p.local_as ? `<div class="text-[10px] text-purple-400 font-mono font-semibold" title="Custom Multi-Instance AS">Local: AS ${p.local_as}</div>` : `<div class="text-[10px] text-slate-500 font-mono">Global AS</div>`}
        </td>
        <td class="py-2.5 px-3">${stateBadge}</td>
        <td class="py-2.5 px-3 text-slate-400">${escapeHtml(p.uptime || '-')}</td>
        <td class="py-2.5 px-3 text-slate-300">
          <span class="text-emerald-400 font-bold">↓ ${p.prefix_received || 0}</span> / 
          <span class="text-blue-400 font-bold">↑ ${p.prefix_sent || 0}</span>
        </td>
        <td class="py-2.5 px-3 font-mono text-[11px] whitespace-nowrap">
          ${p.in_filter ? `<span class="px-1.5 py-0.5 rounded bg-blue-950 text-blue-300 border border-blue-800/50" title="In Filter">IN: ${escapeHtml(p.in_filter)}</span> ` : ''}
          ${p.out_filter ? `<span class="px-1.5 py-0.5 rounded bg-amber-950 text-amber-300 border border-amber-800/50" title="Out Filter">OUT: ${escapeHtml(p.out_filter)}</span>` : ''}
          ${!p.in_filter && !p.out_filter ? '<span class="text-slate-600">-</span>' : ''}
        </td>
        <td class="py-2.5 px-3 text-slate-400 font-sans truncate max-w-xs">${escapeHtml(p.comment || '')}</td>
        <td class="py-2.5 px-3 text-right space-x-1.5 whitespace-nowrap font-sans">
          <button onclick="toggleBgpPeerState('${p.id}', ${!p.disabled})" class="px-2 py-1 rounded text-[11px] ${p.disabled ? 'bg-emerald-950 hover:bg-emerald-900 text-emerald-400 border border-emerald-800/50' : 'bg-slate-800 hover:bg-slate-700 text-slate-300 border border-slate-700'}">
            ${p.disabled ? 'Enable' : 'Disable'}
          </button>
          <button onclick="openEditBgpPeerModal('${p.id}')" class="px-2 py-1 rounded text-[11px] bg-slate-800 hover:bg-slate-700 text-purple-300 border border-slate-700">
            Edit
          </button>
          <button onclick="deleteBgpPeer('${p.id}')" class="px-2 py-1 rounded text-[11px] bg-rose-950/60 hover:bg-rose-900 text-rose-300 border border-rose-900/50">
            Delete
          </button>
        </td>
      </tr>
    `;
  }).join('');
}

function renderBgpNetworks() {
  const tbody = document.getElementById('bgp-nets-table-body');
  if (!tbody) return;
  const empty = document.getElementById('bgp-nets-empty');
  const countBadge = document.getElementById('bgp-nets-count-badge');
  const navBadge = document.getElementById('dyn-badge-bgp-nets');

  const nets = state.bgpNets || [];
  if (countBadge) countBadge.innerText = `${nets.length} Networks`;
  if (navBadge) navBadge.innerText = nets.length;

  if (nets.length === 0) {
    tbody.innerHTML = '';
    if (empty) empty.classList.remove('hidden');
    return;
  }
  if (empty) empty.classList.add('hidden');

  const sig = nets.map(n => `${n.network}:${n.disabled}:${n.comment}`).join(';');
  if (tbody.dataset.sig === sig) return;
  tbody.dataset.sig = sig;

  tbody.innerHTML = nets.map(n => `
    <tr class="hover:bg-slate-800/40 transition">
      <td class="py-2.5 px-3 font-semibold text-purple-300 font-mono">${escapeHtml(n.network)}</td>
      <td class="py-2.5 px-3">
        ${n.disabled 
          ? '<span class="px-2 py-0.5 rounded-full text-[10px] bg-slate-800 text-slate-400 border border-slate-700">Disabled</span>'
          : '<span class="px-2 py-0.5 rounded-full text-[10px] bg-emerald-500/10 text-emerald-400 border border-emerald-500/20">Announcing</span>'}
      </td>
      <td class="py-2.5 px-3">
        ${n.disabled
          ? '<span class="text-slate-600 font-mono text-[10px]">-</span>'
          : '<span class="px-2 py-0.5 rounded text-[10px] bg-slate-800 text-cyan-300 border border-cyan-800/40 font-mono">blackhole (dist 255)</span>'}
      </td>
      <td class="py-2.5 px-3 text-slate-400 font-sans truncate max-w-xs">${escapeHtml(n.comment || '')}</td>
      <td class="py-2.5 px-3 text-right space-x-1 font-sans">
        <button onclick="deleteBgpNetwork('${n.id}')" class="px-2 py-1 rounded text-[11px] bg-rose-950/60 hover:bg-rose-900 text-rose-300 border border-rose-900/50">
          Delete
        </button>
      </td>
    </tr>
  `).join('');
}

function renderBgpRoutes() {
  const tbody = document.getElementById('bgp-routes-table-body');
  if (!tbody) return;
  const empty = document.getElementById('bgp-routes-empty');
  const countBadge = document.getElementById('bgp-routes-count-badge');
  const navBadge = document.getElementById('dyn-badge-bgp-routes');

  const routes = state.bgpRoutes || [];
  if (countBadge) countBadge.innerText = `${routes.length} Routes`;
  if (navBadge) navBadge.innerText = routes.length;

  if (routes.length === 0) {
    tbody.innerHTML = '';
    if (empty) empty.classList.remove('hidden');
    return;
  }
  if (empty) empty.classList.add('hidden');

  const sig = routes.map(r => `${r.prefix}:${r.next_hop}:${r.metric}:${r.path}`).join(';');
  if (tbody.dataset.sig === sig) return;
  tbody.dataset.sig = sig;

  tbody.innerHTML = routes.map(r => `
    <tr class="hover:bg-slate-800/40 transition">
      <td class="py-2.5 px-3 font-semibold text-white">${escapeHtml(r.prefix)}</td>
      <td class="py-2.5 px-3 text-purple-300 font-bold">${escapeHtml(r.next_hop || '-')}</td>
      <td class="py-2.5 px-3 text-slate-300">${r.metric}</td>
      <td class="py-2.5 px-3 text-slate-300">${r.weight}</td>
      <td class="py-2.5 px-3 text-amber-300">${escapeHtml(r.path || 'i')}</td>
      <td class="py-2.5 px-3 text-slate-400">${escapeHtml(r.origin || 'IGP')}</td>
    </tr>
  `).join('');
}

// =========================================================================
// DEBTIK v7 OSPF TABLE RENDERING & SORTING
// =========================================================================

function sortOspfTable(tab, col) {
  if (!state.ospfSort) state.ospfSort = {};
  if (!state.ospfSort[tab]) state.ospfSort[tab] = { col: col, asc: true };
  if (state.ospfSort[tab].col === col) {
    state.ospfSort[tab].asc = !state.ospfSort[tab].asc;
  } else {
    state.ospfSort[tab].col = col;
    state.ospfSort[tab].asc = true;
  }
  const asc = state.ospfSort[tab].asc;

  let list = [];
  if (tab === 'instances') list = state.ospfInstances || [];
  else if (tab === 'areas') list = state.ospfAreas || [];
  else if (tab === 'ranges') list = state.ospfAreaRanges || [];
  else if (tab === 'templates') list = state.ospfTemplates || [];
  else if (tab === 'live_ifaces') list = state.ospfLiveInterfaces || [];
  else if (tab === 'snbrs') list = state.ospfStaticNbrs || [];
  else if (tab === 'neighbors') list = state.ospfNeighbors || [];
  else if (tab === 'lsa') list = state.ospfLSA || [];

  list.sort((a, b) => {
    let valA = a[col] ?? '';
    let valB = b[col] ?? '';
    if (typeof valA === 'number' && typeof valB === 'number') {
      return asc ? valA - valB : valB - valA;
    }
    return asc ? String(valA).localeCompare(String(valB)) : String(valB).localeCompare(String(valA));
  });

  if (tab === 'instances') renderOspfInstances();
  else if (tab === 'areas') renderOspfAreas();
  else if (tab === 'ranges') renderOspfAreaRanges();
  else if (tab === 'templates') renderOspfTemplates();
  else if (tab === 'live_ifaces') renderOspfLiveInterfaces();
  else if (tab === 'snbrs') renderOspfStaticNbrs();
  else if (tab === 'neighbors') renderOspfNeighbors();
  else if (tab === 'lsa') renderOspfLSA();
}

function selectOspfRow(tab, id) {
  if (!state.selectedOspfRow) state.selectedOspfRow = {};
  state.selectedOspfRow[tab] = id;

  if (tab === 'instances') {
    renderOspfInstances();
    const btnEn = document.getElementById('btn-ospf-inst-enable');
    const btnDis = document.getElementById('btn-ospf-inst-disable');
    const btnRem = document.getElementById('btn-ospf-inst-remove');
    const btnCom = document.getElementById('btn-ospf-inst-comment');
    if (btnEn) btnEn.disabled = false;
    if (btnDis) btnDis.disabled = false;
    if (btnRem) btnRem.disabled = false;
    if (btnCom) btnCom.disabled = false;
  } else if (tab === 'areas') {
    renderOspfAreas();
    const btnEn = document.getElementById('btn-ospf-area-enable');
    const btnDis = document.getElementById('btn-ospf-area-disable');
    const btnRem = document.getElementById('btn-ospf-area-remove');
    const btnCom = document.getElementById('btn-ospf-area-comment');
    if (btnEn) btnEn.disabled = false;
    if (btnDis) btnDis.disabled = false;
    if (btnRem) btnRem.disabled = false;
    if (btnCom) btnCom.disabled = false;
  } else if (tab === 'ranges') {
    renderOspfAreaRanges();
    const btnEn = document.getElementById('btn-ospf-range-enable');
    const btnDis = document.getElementById('btn-ospf-range-disable');
    const btnRem = document.getElementById('btn-ospf-range-remove');
    const btnCom = document.getElementById('btn-ospf-range-comment');
    if (btnEn) btnEn.disabled = false;
    if (btnDis) btnDis.disabled = false;
    if (btnRem) btnRem.disabled = false;
    if (btnCom) btnCom.disabled = false;
  } else if (tab === 'templates') {
    renderOspfTemplates();
    const btnEn = document.getElementById('btn-ospf-tmpl-enable');
    const btnDis = document.getElementById('btn-ospf-tmpl-disable');
    const btnRem = document.getElementById('btn-ospf-tmpl-remove');
    const btnCom = document.getElementById('btn-ospf-tmpl-comment');
    if (btnEn) btnEn.disabled = false;
    if (btnDis) btnDis.disabled = false;
    if (btnRem) btnRem.disabled = false;
    if (btnCom) btnCom.disabled = false;
  } else if (tab === 'snbrs') {
    renderOspfStaticNbrs();
    const btnEn = document.getElementById('btn-ospf-snbr-enable');
    const btnDis = document.getElementById('btn-ospf-snbr-disable');
    const btnRem = document.getElementById('btn-ospf-snbr-remove');
    const btnCom = document.getElementById('btn-ospf-snbr-comment');
    if (btnEn) btnEn.disabled = false;
    if (btnDis) btnDis.disabled = false;
    if (btnRem) btnRem.disabled = false;
    if (btnCom) btnCom.disabled = false;
  }
}

// TAB 1: INSTANCES
function renderOspfInstances() {
  const tbody = document.getElementById('ospf-instances-table-body');
  if (!tbody) return;
  const countEl = document.getElementById('ospf-instances-footer-count');
  const filter = (document.getElementById('filter-ospf-instances')?.value || '').toLowerCase();

  let list = state.ospfInstances || [];
  if (filter) {
    list = list.filter(i => (i.name || '').toLowerCase().includes(filter) || (i.router_id || '').toLowerCase().includes(filter) || (i.comment || '').toLowerCase().includes(filter));
  }

  if (countEl) countEl.innerText = list.length;

  const selId = state.selectedOspfRow?.instances;

  tbody.innerHTML = list.map((inst, idx) => {
    const isSel = inst.id === selId;
    const selClass = isSel ? 'bg-[#1b2f48] text-white border-l-2 border-sky-400' : 'hover:bg-[#1a2636] text-slate-300';
    const flagD = inst.disabled ? '<span class="text-rose-400 font-bold" title="Disabled">X</span>' : '';

    return `
      <tr class="${selClass} cursor-pointer transition select-none" onclick="selectOspfRow('instances', '${inst.id}')" ondblclick="openEditOspfInstanceModal('${inst.id}')">
        <td class="py-1.5 px-3 w-8 text-center text-slate-500">${idx}</td>
        <td class="py-1.5 px-3 w-12 text-center text-sky-400">${flagD || '🔀'}</td>
        <td class="py-1.5 px-3 text-slate-400 italic">${escapeHtml(inst.comment || '')}</td>
        <td class="py-1.5 px-3 font-semibold text-white flex items-center gap-1.5">
          <span class="text-sky-400">↳</span> <span>${escapeHtml(inst.name || 'Default')}</span>
        </td>
        <td class="py-1.5 px-3">${inst.version || 2}</td>
        <td class="py-1.5 px-3 font-mono text-slate-300">${escapeHtml(inst.vrf || 'main')}</td>
        <td class="py-1.5 px-3 font-mono font-medium text-sky-300">${escapeHtml(inst.router_id || '192.168.131.56')}</td>
      </tr>
    `;
  }).join('');
}

// TAB 2: AREAS
function renderOspfAreas() {
  const tbody = document.getElementById('ospf-areas-table-body');
  if (!tbody) return;
  const countEl = document.getElementById('ospf-areas-footer-count');
  const filter = (document.getElementById('filter-ospf-areas')?.value || '').toLowerCase();

  let list = state.ospfAreas || [];
  if (filter) {
    list = list.filter(a => (a.name || '').toLowerCase().includes(filter) || (a.area_id || '').toLowerCase().includes(filter) || (a.comment || '').toLowerCase().includes(filter));
  }

  if (countEl) countEl.innerText = list.length;
  const selId = state.selectedOspfRow?.areas;

  tbody.innerHTML = list.map((a, idx) => {
    const isSel = a.id === selId;
    const selClass = isSel ? 'bg-[#1b2f48] text-white border-l-2 border-sky-400' : 'hover:bg-[#1a2636] text-slate-300';
    const flagD = a.disabled ? '<span class="text-rose-400 font-bold" title="Disabled">X</span>' : '';

    return `
      <tr class="${selClass} cursor-pointer transition select-none" onclick="selectOspfRow('areas', '${a.id}')" ondblclick="openEditOspfAreaModal('${a.id}')">
        <td class="py-1.5 px-3 w-8 text-center text-slate-500">${idx}</td>
        <td class="py-1.5 px-3 w-12 text-center text-sky-400">${flagD || '🌐'}</td>
        <td class="py-1.5 px-3 text-slate-400 italic">${escapeHtml(a.comment || '')}</td>
        <td class="py-1.5 px-3 font-semibold text-white flex items-center gap-1.5">
          <span class="text-sky-400">↳</span> <span>${escapeHtml(a.name || 'Default')}</span>
        </td>
        <td class="py-1.5 px-3 text-slate-300">${escapeHtml(a.instance || 'Default')}</td>
        <td class="py-1.5 px-3 font-mono font-medium text-sky-300">${escapeHtml(a.area_id || '0.0.0.0')}</td>
        <td class="py-1.5 px-3 font-mono text-slate-400">${escapeHtml(a.area_type || 'default')}</td>
      </tr>
    `;
  }).join('');
}

// TAB 3: AREA RANGES
function renderOspfAreaRanges() {
  const tbody = document.getElementById('ospf-ranges-table-body');
  if (!tbody) return;
  const countEl = document.getElementById('ospf-ranges-footer-count');
  const filter = (document.getElementById('filter-ospf-area-ranges')?.value || '').toLowerCase();

  let list = state.ospfAreaRanges || [];
  if (filter) {
    list = list.filter(r => (r.prefix || '').toLowerCase().includes(filter) || (r.area || '').toLowerCase().includes(filter) || (r.comment || '').toLowerCase().includes(filter));
  }

  if (countEl) countEl.innerText = list.length;
  const selId = state.selectedOspfRow?.['area-ranges'];

  tbody.innerHTML = list.map((r, idx) => {
    const isSel = r.id === selId;
    const selClass = isSel ? 'bg-[#1b2f48] text-white border-l-2 border-sky-400' : 'hover:bg-[#1a2636] text-slate-300';
    const flagD = r.disabled ? '<span class="text-rose-400 font-bold" title="Disabled">X</span>' : '';

    return `
      <tr class="${selClass} cursor-pointer transition select-none" onclick="selectOspfRow('ranges', '${r.id}')" ondblclick="openEditOspfAreaRangeModal('${r.id}')">
        <td class="py-1.5 px-3 w-8 text-center text-slate-500">${idx}</td>
        <td class="py-1.5 px-3 w-12 text-center text-sky-400">${flagD || '🏷'}</td>
        <td class="py-1.5 px-3 text-slate-400 italic">${escapeHtml(r.comment || '')}</td>
        <td class="py-1.5 px-3 font-semibold text-white">${escapeHtml(r.area || 'Default')}</td>
        <td class="py-1.5 px-3 font-mono font-medium text-sky-300">${escapeHtml(r.prefix || '')}</td>
        <td class="py-1.5 px-3">${r.cost || 1}</td>
        <td class="py-1.5 px-3">${r.advertise !== false ? 'yes' : 'no'}</td>
      </tr>
    `;
  }).join('');
}

// TAB 4: INTERFACE TEMPLATES
function renderOspfTemplates() {
  const tbody = document.getElementById('ospf-templates-table-body');
  if (!tbody) return;
  const countEl = document.getElementById('ospf-templates-footer-count');
  const filter = (document.getElementById('filter-ospf-templates')?.value || '').toLowerCase();

  let list = state.ospfTemplates || [];
  if (filter) {
    list = list.filter(t => (t.interfaces || t.interface || '').toLowerCase().includes(filter) || (t.networks || t.network || '').toLowerCase().includes(filter) || (t.comment || '').toLowerCase().includes(filter));
  }

  if (countEl) countEl.innerText = list.length;
  const selId = state.selectedOspfRow?.templates;

  tbody.innerHTML = list.map((t, idx) => {
    const isSel = t.id === selId;
    const selClass = isSel ? 'bg-[#1b2f48] text-white border-l-2 border-sky-400' : 'hover:bg-[#1a2636] text-slate-300';
    const ifaces = t.interfaces || t.interface || 'all';
    const nets = t.networks || t.network || '';
    const flagD = t.disabled ? '<span class="text-rose-400 font-bold" title="Disabled">X</span>' : '';

    return `
      <tr class="${selClass} cursor-pointer transition select-none" onclick="selectOspfRow('templates', '${t.id}')" ondblclick="openEditOspfTemplateModal('${t.id}')">
        <td class="py-1.5 px-3 w-8 text-center text-slate-500 font-bold">${idx}</td>
        <td class="py-1.5 px-3 w-12 text-center text-sky-400">${flagD || '🔀'}</td>
        <td class="py-1.5 px-3 text-slate-400 italic">${escapeHtml(t.comment || '')}</td>
        <td class="py-1.5 px-3 font-semibold text-white flex items-center gap-1.5">
          <span class="text-sky-400">↳</span> <span>${escapeHtml(ifaces)}</span>
        </td>
        <td class="py-1.5 px-3 text-slate-300">${escapeHtml(t.area || 'Default')}</td>
        <td class="py-1.5 px-3 font-mono text-sky-300">${escapeHtml(nets)}</td>
        <td class="py-1.5 px-3 font-mono text-slate-300">${escapeHtml(t.network_type || 'broadcast')}</td>
        <td class="py-1.5 px-3">${t.cost || 1}</td>
        <td class="py-1.5 px-3">${t.priority || 128}</td>
        <td class="py-1.5 px-3 text-slate-400">${escapeHtml(t.auth || t.auth_type || '')}</td>
      </tr>
    `;
  }).join('');
}

// TAB 5: LIVE INTERFACES
function renderOspfLiveInterfaces() {
  const tbody = document.getElementById('ospf-live-interfaces-table-body');
  if (!tbody) return;
  const countEl = document.getElementById('ospf-live-interfaces-footer-count');
  const filter = (document.getElementById('filter-ospf-interfaces')?.value || '').toLowerCase();

  let list = state.ospfLiveInterfaces || [];
  if (filter) {
    list = list.filter(i => (i.interface || '').toLowerCase().includes(filter) || (i.address || '').toLowerCase().includes(filter) || (i.state || '').toLowerCase().includes(filter));
  }

  if (countEl) countEl.innerText = list.length;

  tbody.innerHTML = list.map(i => `
    <tr class="hover:bg-[#1a2636] text-slate-300 transition select-none">
      <td class="py-1.5 px-3 w-12 text-center text-sky-400 font-bold">${escapeHtml(i.flags || 'D')}</td>
      <td class="py-1.5 px-3 font-semibold text-white">${escapeHtml(i.interface || '')}</td>
      <td class="py-1.5 px-3 font-mono text-sky-300 font-medium">${escapeHtml(i.address || '')}</td>
      <td class="py-1.5 px-3 text-slate-300">${escapeHtml(i.area || 'Default')}</td>
      <td class="py-1.5 px-3 text-center text-slate-400">${i.instance_id || 0}</td>
      <td class="py-1.5 px-3 font-mono text-amber-300 lowercase">${escapeHtml(i.state || 'waiting')}</td>
      <td class="py-1.5 px-3">${i.cost || 1}</td>
      <td class="py-1.5 px-3">${i.priority || 128}</td>
    </tr>
  `).join('');
}

// TAB 6: STATIC NEIGHBORS
function renderOspfStaticNbrs() {
  const tbody = document.getElementById('ospf-snbrs-table-body');
  if (!tbody) return;
  const countEl = document.getElementById('ospf-snbrs-footer-count');
  const filter = (document.getElementById('filter-ospf-static-nbrs')?.value || '').toLowerCase();

  let list = state.ospfStaticNbrs || [];
  if (filter) {
    list = list.filter(n => (n.address || '').toLowerCase().includes(filter) || (n.area || '').toLowerCase().includes(filter) || (n.comment || '').toLowerCase().includes(filter));
  }

  if (countEl) countEl.innerText = list.length;
  const selId = state.selectedOspfRow?.['static-nbrs'];

  tbody.innerHTML = list.map((n, idx) => {
    const isSel = n.id === selId;
    const selClass = isSel ? 'bg-[#1b2f48] text-white border-l-2 border-sky-400' : 'hover:bg-[#1a2636] text-slate-300';
    const flagD = n.disabled ? '<span class="text-rose-400 font-bold" title="Disabled">X</span>' : '';

    return `
      <tr class="${selClass} cursor-pointer transition select-none" onclick="selectOspfRow('snbrs', '${n.id}')" ondblclick="openEditOspfStaticNbrModal('${n.id}')">
        <td class="py-1.5 px-3 w-8 text-center text-slate-500">${idx}</td>
        <td class="py-1.5 px-3 w-12 text-center text-sky-400">${flagD || '📡'}</td>
        <td class="py-1.5 px-3 text-slate-400 italic">${escapeHtml(n.comment || '')}</td>
        <td class="py-1.5 px-3 font-semibold font-mono text-sky-300">${escapeHtml(n.address || '')}</td>
        <td class="py-1.5 px-3 text-slate-300">${escapeHtml(n.area || 'Default')}</td>
        <td class="py-1.5 px-3">${n.poll_interval || 120}s</td>
        <td class="py-1.5 px-3">${n.cost || 1}</td>
      </tr>
    `;
  }).join('');
}

// TAB 7: LIVE NEIGHBORS
function renderOspfNeighbors() {
  const tbody = document.getElementById('ospf-neighbors-table-body');
  if (!tbody) return;
  const countEl = document.getElementById('ospf-neighbors-footer-count');
  const filter = (document.getElementById('filter-ospf-neighbors')?.value || '').toLowerCase();

  let list = state.ospfNeighbors || [];
  if (filter) {
    list = list.filter(n => (n.address || '').toLowerCase().includes(filter) || (n.state || '').toLowerCase().includes(filter) || (n.instance || '').toLowerCase().includes(filter));
  }

  if (countEl) countEl.innerText = list.length;

  tbody.innerHTML = list.map(n => `
    <tr class="hover:bg-[#1a2636] text-slate-300 transition select-none">
      <td class="py-1.5 px-3 w-12 text-center text-sky-400 font-bold">${escapeHtml(n.flags || 'D')}</td>
      <td class="py-1.5 px-3 text-slate-400 italic">${escapeHtml(n.comment || '')}</td>
      <td class="py-1.5 px-3 font-semibold text-white flex items-center gap-1.5">
        <span class="text-sky-400">↳</span> <span>${escapeHtml(n.instance || 'Default')}</span>
      </td>
      <td class="py-1.5 px-3 text-slate-300">${escapeHtml(n.area || 'Default')}</td>
      <td class="py-1.5 px-3 font-mono font-medium text-sky-300">${escapeHtml(n.address || '')}</td>
      <td class="py-1.5 px-3 font-mono font-bold text-emerald-400">${escapeHtml(n.state || 'Full')}</td>
      <td class="py-1.5 px-3 text-slate-400">${n.state_changes ?? 6}</td>
    </tr>
  `).join('');
}

// TAB 8: LINK-STATE DATABASE (LSA)
function renderOspfLSA() {
  const tbody = document.getElementById('ospf-lsa-table-body');
  if (!tbody) return;
  const countEl = document.getElementById('ospf-lsa-footer-count');
  const filter = (document.getElementById('filter-ospf-lsa')?.value || '').toLowerCase();

  let list = state.ospfLSA || [];
  if (filter) {
    list = list.filter(l => (l.type || '').toLowerCase().includes(filter) || (l.originator || '').toLowerCase().includes(filter) || (l.id || '').toLowerCase().includes(filter));
  }

  if (countEl) countEl.innerText = list.length;

  tbody.innerHTML = list.map(l => `
    <tr class="hover:bg-[#1a2636] text-slate-300 transition select-none">
      <td class="py-1.5 px-3 w-12 text-center text-sky-400 font-bold">${escapeHtml(l.flags || 'D')}</td>
      <td class="py-1.5 px-3 font-semibold text-white flex items-center gap-1.5">
        <span class="text-sky-400">↳</span> <span>${escapeHtml(l.instance || 'Default')}</span>
      </td>
      <td class="py-1.5 px-3 text-slate-300">${escapeHtml(l.area || 'Default')}</td>
      <td class="py-1.5 px-3 font-mono text-amber-300">${escapeHtml(l.type || 'router')}</td>
      <td class="py-1.5 px-3 font-mono text-slate-300">${escapeHtml(l.originator || '')}</td>
      <td class="py-1.5 px-3 font-mono text-sky-300 font-medium">${escapeHtml(l.id || '')}</td>
      <td class="py-1.5 px-3 text-slate-500">${escapeHtml(l.link || '')}</td>
      <td class="py-1.5 px-3 text-slate-500">${l.link_index ?? 0}</td>
      <td class="py-1.5 px-3 font-mono text-slate-300">${escapeHtml(l.sequence || '')}</td>
      <td class="py-1.5 px-3 text-slate-400">${l.age ?? 0}</td>
    </tr>
  `).join('');
}

function renderOspfStatusPill() {
  // Maintained for backward compatibility
  const pill = document.getElementById('ospf-live-status-pill');
  if (!pill) return;
  pill.className = 'text-[10px] px-2 py-0.5 rounded font-mono bg-indigo-950 text-indigo-300 border border-indigo-800/60 font-semibold';
  pill.innerText = 'OSPF ACTIVE';
}

function renderOspfInterfaces() {
  renderOspfTemplates();
}

function renderOspfRoutes() {
  // Routes retained in background
}

// BGP Modals & Actions
function openBgpInstanceModal() {
  const inst = state.bgpInstance || { enabled: false, as: 65001, router_id: '192.168.131.56', hold_time: 180, keepalive_time: 60 };
  document.getElementById('modal-bgp-enabled').checked = !!inst.enabled;
  document.getElementById('modal-bgp-as').value = inst.as || 65001;
  document.getElementById('modal-bgp-router-id').value = inst.router_id || '';
  document.getElementById('modal-bgp-keepalive').value = inst.keepalive_time || 60;
  document.getElementById('modal-bgp-holdtime').value = inst.hold_time || 180;
  document.getElementById('modal-bgp-redist-conn').checked = !!inst.redistribute_connected;
  document.getElementById('modal-bgp-redist-static').checked = !!inst.redistribute_static;
  document.getElementById('modal-bgp-redist-ospf').checked = !!inst.redistribute_ospf;
  document.getElementById('bgp-instance-modal').classList.remove('hidden');
}

function closeBgpInstanceModal() {
  document.getElementById('bgp-instance-modal').classList.add('hidden');
}

async function submitBgpInstance(e) {
  e.preventDefault();
  const payload = {
    enabled: document.getElementById('modal-bgp-enabled').checked,
    as: parseInt(document.getElementById('modal-bgp-as').value, 10),
    router_id: document.getElementById('modal-bgp-router-id').value.trim(),
    keepalive_time: parseInt(document.getElementById('modal-bgp-keepalive').value, 10),
    hold_time: parseInt(document.getElementById('modal-bgp-holdtime').value, 10),
    redistribute_connected: document.getElementById('modal-bgp-redist-conn').checked,
    redistribute_static: document.getElementById('modal-bgp-redist-static').checked,
    redistribute_ospf: document.getElementById('modal-bgp-redist-ospf').checked
  };

  try {
    const res = await fetch(`${API_BASE}/routing/bgp/instance`, {
      method: 'POST',
      headers: { 'Content-Type': 'application/json' },
      body: JSON.stringify(payload)
    });
    if (res.ok) {
      closeBgpInstanceModal();
      showToast('Success', 'BGP instance configuration updated', 'success');
      loadDynamicRouting();
    } else {
      const err = await res.json();
      showToast('Error', err.error || 'Failed to update BGP instance', 'error');
    }
  } catch (err) {
    showToast('Error', err.message, 'error');
  }
}

// ----------------- BGP Peer Connection Modal (DebTik v7) -----------------
function switchBgpPeerModalTab(tab) {
  // Normalize legacy tab names
  if (tab === 'extra' || tab === 'filter') tab = 'filters';
  if (tab === 'attributes') tab = 'networks';

  const tabs = ['general', 'filters', 'networks'];
  tabs.forEach(t => {
    const pane = document.getElementById(`bgp-peer-tab-${t}`);
    const btn = document.getElementById(`bgp-peer-tab-btn-${t}`);
    if (t === tab) {
      if (pane) pane.classList.remove('hidden');
      if (btn) btn.className = 'px-4 py-2 text-xs font-bold border-b-2 border-cyan-500 text-white transition';
    } else {
      if (pane) pane.classList.add('hidden');
      if (btn) btn.className = 'px-4 py-2 text-xs font-bold border-b-2 border-transparent text-slate-400 hover:text-slate-200 transition';
    }
  });
}

function addOutputNetworkRow(val = '') {
  const container = document.getElementById('modal-bgp-output-networks-container');
  if (!container) return;
  const row = document.createElement('div');
  row.className = 'flex items-center gap-2 output-net-row';
  row.innerHTML = `
    <input type="text" value="${escapeHtml(val)}" placeholder="e.g. 192.168.100.0/24" class="flex-1 bg-slate-900 border border-slate-700 rounded-lg px-3 py-1.5 text-white font-mono text-xs focus:outline-none focus:border-cyan-500">
    <button type="button" onclick="this.closest('.output-net-row').remove()" class="w-7 h-7 flex items-center justify-center bg-slate-800 hover:bg-rose-950 text-slate-400 hover:text-rose-400 border border-slate-700 rounded-lg text-base font-bold transition" title="Remove network">-</button>
  `;
  container.appendChild(row);
}

function parseBgpTime(val) {
  if (!val) return 0;
  val = String(val).trim();
  if (val.includes(':')) {
    const parts = val.split(':').map(x => parseInt(x, 10) || 0);
    if (parts.length === 3) return parts[0] * 3600 + parts[1] * 60 + parts[2];
    if (parts.length === 2) return parts[0] * 60 + parts[1];
  }
  return parseInt(val, 10) || 0;
}

function formatBgpTime(secs) {
  if (!secs || secs <= 0) return '30';
  return String(secs);
}

function populateBgpRoutingTables() {
  const sel = document.getElementById('modal-bgp-peer-routing-table');
  if (!sel) return;
  const cur = sel.value || 'main';
  sel.innerHTML = '<option value="main">main</option>';
  (state.routingTables || []).forEach(t => {
    if (t.name !== 'main') {
      const opt = document.createElement('option');
      opt.value = t.name;
      opt.innerText = t.name;
      sel.appendChild(opt);
    }
  });
  sel.value = cur;
}

function openAddBgpPeerModal() {
  document.getElementById('bgp-peer-form').reset();
  document.getElementById('modal-bgp-peer-id').value = '';
  document.getElementById('bgp-peer-modal-title').innerText = 'New BGP Connection...';
  
  // General Tab
  document.getElementById('modal-bgp-peer-enabled').checked = true;
  document.getElementById('modal-bgp-peer-name').value = '';
  document.getElementById('modal-bgp-peer-comment').value = '';
  if (document.getElementById('modal-bgp-peer-local-as')) document.getElementById('modal-bgp-peer-local-as').value = '';
  if (document.getElementById('modal-bgp-peer-remote-addr')) document.getElementById('modal-bgp-peer-remote-addr').value = '';
  if (document.getElementById('modal-bgp-peer-remote-port')) document.getElementById('modal-bgp-peer-remote-port').value = '';
  if (document.getElementById('modal-bgp-peer-remote-as')) document.getElementById('modal-bgp-peer-remote-as').value = '';
  if (document.getElementById('modal-bgp-peer-local-addr')) document.getElementById('modal-bgp-peer-local-addr').value = '';
  if (document.getElementById('modal-bgp-peer-local-port')) document.getElementById('modal-bgp-peer-local-port').value = '';
  if (document.getElementById('modal-bgp-peer-local-role')) document.getElementById('modal-bgp-peer-local-role').value = 'ebgp';
  if (document.getElementById('modal-bgp-peer-password')) document.getElementById('modal-bgp-peer-password').value = '';
  if (document.getElementById('modal-bgp-peer-multihop')) document.getElementById('modal-bgp-peer-multihop').checked = false;
  if (document.getElementById('modal-bgp-peer-passive')) document.getElementById('modal-bgp-peer-passive').checked = false;
  if (document.getElementById('modal-bgp-peer-nexthop-self')) document.getElementById('modal-bgp-peer-nexthop-self').checked = false;
  if (document.getElementById('modal-bgp-peer-holdtime')) document.getElementById('modal-bgp-peer-holdtime').value = '30';
  if (document.getElementById('modal-bgp-peer-keepalive')) document.getElementById('modal-bgp-peer-keepalive').value = '10';

  // Filters Tab
  populateFilterChainsDatalist();
  if (document.getElementById('modal-bgp-peer-in-filter')) document.getElementById('modal-bgp-peer-in-filter').value = '';
  if (document.getElementById('modal-bgp-peer-out-filter')) document.getElementById('modal-bgp-peer-out-filter').value = '';
  if (document.getElementById('modal-bgp-peer-redist-conn')) document.getElementById('modal-bgp-peer-redist-conn').checked = false;
  if (document.getElementById('modal-bgp-peer-redist-static')) document.getElementById('modal-bgp-peer-redist-static').checked = true;
  if (document.getElementById('modal-bgp-peer-redist-ospf')) document.getElementById('modal-bgp-peer-redist-ospf').checked = false;
  if (document.getElementById('modal-bgp-peer-default-orig')) document.getElementById('modal-bgp-peer-default-orig').checked = false;

  // Advertised Networks Tab
  const container = document.getElementById('modal-bgp-output-networks-container');
  if (container) {
    container.innerHTML = '';
    addOutputNetworkRow('');
  }

  const removeBtn = document.getElementById('modal-btn-remove-peer');
  if (removeBtn) removeBtn.classList.add('hidden');

  switchBgpPeerModalTab('general');
  document.getElementById('bgp-peer-modal').classList.remove('hidden');
}

function populateFilterChainsDatalist() {
  const dl = document.getElementById('filter-chains-list');
  if (!dl) return;
  const chains = new Set();
  (state.routingFilters || []).forEach(f => {
    if (f.chain) chains.add(f.chain);
  });
  if (chains.size === 0) {
    chains.add('awmn');
    chains.add('Internal');
    chains.add('bgp-in');
    chains.add('bgp-out');
  }
  dl.innerHTML = '';
  chains.forEach(c => {
    const opt = document.createElement('option');
    opt.value = c;
    dl.appendChild(opt);
  });
}

function openEditBgpPeerModal(id) {
  const p = (state.bgpPeers || []).find(item => item.id === id);
  if (!p) return;

  populateFilterChainsDatalist();

  document.getElementById('modal-bgp-peer-id').value = p.id;
  document.getElementById('bgp-peer-modal-title').innerText = p.name || p.id;
  
  // General Tab
  document.getElementById('modal-bgp-peer-enabled').checked = p.enabled !== false && !p.disabled;
  document.getElementById('modal-bgp-peer-name').value = p.name || '';
  document.getElementById('modal-bgp-peer-comment').value = p.comment || '';
  if (document.getElementById('modal-bgp-peer-local-as')) document.getElementById('modal-bgp-peer-local-as').value = p.local_as || '';
  if (document.getElementById('modal-bgp-peer-remote-addr')) document.getElementById('modal-bgp-peer-remote-addr').value = p.remote_address || '';
  if (document.getElementById('modal-bgp-peer-remote-port')) document.getElementById('modal-bgp-peer-remote-port').value = p.remote_port || '';
  if (document.getElementById('modal-bgp-peer-remote-as')) document.getElementById('modal-bgp-peer-remote-as').value = p.remote_as || '';
  if (document.getElementById('modal-bgp-peer-local-addr')) document.getElementById('modal-bgp-peer-local-addr').value = p.local_address || '';
  if (document.getElementById('modal-bgp-peer-local-port')) document.getElementById('modal-bgp-peer-local-port').value = p.local_port || '';
  if (document.getElementById('modal-bgp-peer-local-role')) document.getElementById('modal-bgp-peer-local-role').value = p.local_role || 'ebgp';
  if (document.getElementById('modal-bgp-peer-password')) document.getElementById('modal-bgp-peer-password').value = p.password || '';
  if (document.getElementById('modal-bgp-peer-multihop')) document.getElementById('modal-bgp-peer-multihop').checked = !!p.multihop;
  
  // Passive mode
  const isPassive = !!p.passive || (p.connect === false && p.listen !== false);
  if (document.getElementById('modal-bgp-peer-passive')) document.getElementById('modal-bgp-peer-passive').checked = isPassive;

  // Next-hop self
  const isNexthopSelf = !!p.nexthop_self || p.nexthop_choice === 'force-self';
  if (document.getElementById('modal-bgp-peer-nexthop-self')) document.getElementById('modal-bgp-peer-nexthop-self').checked = isNexthopSelf;

  if (document.getElementById('modal-bgp-peer-holdtime')) document.getElementById('modal-bgp-peer-holdtime').value = p.hold_time ? String(p.hold_time) : '30';
  if (document.getElementById('modal-bgp-peer-keepalive')) document.getElementById('modal-bgp-peer-keepalive').value = p.keepalive_time ? String(p.keepalive_time) : '10';

  // Filters Tab
  if (document.getElementById('modal-bgp-peer-in-filter')) document.getElementById('modal-bgp-peer-in-filter').value = p.in_filter || '';
  if (document.getElementById('modal-bgp-peer-out-filter')) document.getElementById('modal-bgp-peer-out-filter').value = p.out_filter || '';
  if (document.getElementById('modal-bgp-peer-redist-conn')) document.getElementById('modal-bgp-peer-redist-conn').checked = !!p.redist_connected;
  if (document.getElementById('modal-bgp-peer-redist-static')) document.getElementById('modal-bgp-peer-redist-static').checked = p.redist_static !== false;
  if (document.getElementById('modal-bgp-peer-redist-ospf')) document.getElementById('modal-bgp-peer-redist-ospf').checked = !!p.redist_ospf;
  if (document.getElementById('modal-bgp-peer-default-orig')) document.getElementById('modal-bgp-peer-default-orig').checked = !!p.default_originate;

  // Advertised Networks Tab
  const container = document.getElementById('modal-bgp-output-networks-container');
  if (container) {
    container.innerHTML = '';
    if (p.output_networks && p.output_networks.length > 0) {
      p.output_networks.forEach(net => addOutputNetworkRow(net));
    } else {
      addOutputNetworkRow('');
    }
  }

  const removeBtn = document.getElementById('modal-btn-remove-peer');
  if (removeBtn) removeBtn.classList.remove('hidden');

  switchBgpPeerModalTab('general');
  document.getElementById('bgp-peer-modal').classList.remove('hidden');
}

function copyCurrentBgpPeer() {
  document.getElementById('modal-bgp-peer-id').value = '';
  const nameEl = document.getElementById('modal-bgp-peer-name');
  if (nameEl) nameEl.value = (nameEl.value || 'peer') + '-copy';
  document.getElementById('bgp-peer-modal-title').innerText = 'New BGP Connection...';
  const removeBtn = document.getElementById('modal-btn-remove-peer');
  if (removeBtn) removeBtn.classList.add('hidden');
  showToast('Cloned', 'BGP connection copied to new draft', 'info');
}

function removeCurrentBgpPeer() {
  const id = document.getElementById('modal-bgp-peer-id')?.value;
  if (!id) return;
  deleteBgpPeer(id);
  closeBgpPeerModal();
}

function closeBgpPeerModal() {
  document.getElementById('bgp-peer-modal').classList.add('hidden');
}

function getBgpPeerFormData() {
  const netInputs = document.querySelectorAll('#modal-bgp-output-networks-container .output-net-row input');
  const outputNetworks = [];
  netInputs.forEach(inp => {
    const v = inp.value.trim();
    if (v) outputNetworks.push(v);
  });

  const enabled = document.getElementById('modal-bgp-peer-enabled').checked;
  const isPassive = document.getElementById('modal-bgp-peer-passive')?.checked || false;
  const isNexthopSelf = document.getElementById('modal-bgp-peer-nexthop-self')?.checked || false;

  return {
    id: document.getElementById('modal-bgp-peer-id').value,
    name: document.getElementById('modal-bgp-peer-name').value.trim(),
    enabled: enabled,
    disabled: !enabled,
    comment: document.getElementById('modal-bgp-peer-comment').value.trim(),
    local_as: parseInt(document.getElementById('modal-bgp-peer-local-as')?.value, 10) || 0,
    remote_address: document.getElementById('modal-bgp-peer-remote-addr').value.trim(),
    remote_port: parseInt(document.getElementById('modal-bgp-peer-remote-port').value, 10) || 0,
    remote_as: parseInt(document.getElementById('modal-bgp-peer-remote-as').value, 10) || 0,
    local_address: document.getElementById('modal-bgp-peer-local-addr')?.value.trim() || '',
    local_port: parseInt(document.getElementById('modal-bgp-peer-local-port')?.value, 10) || 0,
    local_role: document.getElementById('modal-bgp-peer-local-role')?.value || 'ebgp',
    password: document.getElementById('modal-bgp-peer-password')?.value || '',
    multihop: document.getElementById('modal-bgp-peer-multihop')?.checked || false,
    passive: isPassive,
    connect: !isPassive,
    listen: true,
    hold_time: parseBgpTime(document.getElementById('modal-bgp-peer-holdtime')?.value),
    keepalive_time: parseBgpTime(document.getElementById('modal-bgp-peer-keepalive')?.value),
    nexthop_self: isNexthopSelf,
    nexthop_choice: isNexthopSelf ? 'force-self' : 'default',
    in_filter: (document.getElementById('modal-bgp-peer-in-filter')?.value || '').trim(),
    out_filter: (document.getElementById('modal-bgp-peer-out-filter')?.value || '').trim(),
    default_originate: document.getElementById('modal-bgp-peer-default-orig')?.checked || false,
    redist_connected: document.getElementById('modal-bgp-peer-redist-conn')?.checked || false,
    redist_static: document.getElementById('modal-bgp-peer-redist-static')?.checked !== false,
    redist_ospf: document.getElementById('modal-bgp-peer-redist-ospf')?.checked || false,
    output_networks: outputNetworks
  };
}

async function submitBgpPeer(e) {
  if (e) e.preventDefault();
  const payload = getBgpPeerFormData();

  try {
    const res = await fetch(`${API_BASE}/routing/bgp/peers`, {
      method: 'POST',
      headers: { 'Content-Type': 'application/json' },
      body: JSON.stringify(payload)
    });
    if (res.ok) {
      closeBgpPeerModal();
      showToast('Success', 'BGP Connection saved', 'success');
      loadDynamicRouting();
    } else {
      const err = await res.json();
      showToast('Error', err.error || 'Failed to save peer', 'error');
    }
  } catch (err) {
    showToast('Error', err.message, 'error');
  }
}

async function applyBgpPeerModal(e) {
  if (e) e.preventDefault();
  const payload = getBgpPeerFormData();

  try {
    const res = await fetch(`${API_BASE}/routing/bgp/peers`, {
      method: 'POST',
      headers: { 'Content-Type': 'application/json' },
      body: JSON.stringify(payload)
    });
    if (res.ok) {
      const data = await res.json();
      if (data.peer && data.peer.id) {
        document.getElementById('modal-bgp-peer-id').value = data.peer.id;
        document.getElementById('bgp-peer-modal-title').innerText = data.peer.name || data.peer.id;
        document.getElementById('modal-btn-remove-peer')?.classList.remove('hidden');
      }
      showToast('Applied', 'BGP Connection applied', 'success');
      loadDynamicRouting();
    } else {
      const err = await res.json();
      showToast('Error', err.error || 'Failed to apply peer', 'error');
    }
  } catch (err) {
    showToast('Error', err.message, 'error');
  }
}

async function deleteBgpPeer(id) {
  if (!confirm('Are you sure you want to delete this BGP peer connection?')) return;
  try {
    const res = await fetch(`${API_BASE}/routing/bgp/peers/${encodeURIComponent(id)}`, { method: 'DELETE' });
    if (res.ok) {
      showToast('Deleted', 'BGP peer removed', 'success');
      loadDynamicRouting();
    }
  } catch (err) {
    showToast('Error', err.message, 'error');
  }
}

async function toggleBgpPeerState(id, disabled) {
  try {
    const res = await fetch(`${API_BASE}/routing/bgp/peers/${encodeURIComponent(id)}/state`, {
      method: 'POST',
      headers: { 'Content-Type': 'application/json' },
      body: JSON.stringify({ disabled })
    });
    if (res.ok) {
      showToast('Updated', `Peer ${disabled ? 'disabled' : 'enabled'}`, 'success');
      loadDynamicRouting();
    }
  } catch (err) {
    showToast('Error', err.message, 'error');
  }
}

function openAddBgpNetworkModal() {
  document.getElementById('bgp-network-form').reset();
  document.getElementById('modal-bgp-net-id').value = '';
  document.getElementById('bgp-network-modal').classList.remove('hidden');
}

function closeBgpNetworkModal() {
  document.getElementById('bgp-network-modal').classList.add('hidden');
}

async function submitBgpNetwork(e) {
  e.preventDefault();
  const payload = {
    id: document.getElementById('modal-bgp-net-id').value,
    network: document.getElementById('modal-bgp-net-cidr').value.trim(),
    comment: document.getElementById('modal-bgp-net-comment').value.trim(),
    disabled: document.getElementById('modal-bgp-net-disabled').checked
  };

  try {
    const res = await fetch(`${API_BASE}/routing/bgp/networks`, {
      method: 'POST',
      headers: { 'Content-Type': 'application/json' },
      body: JSON.stringify(payload)
    });
    if (res.ok) {
      closeBgpNetworkModal();
      showToast('Success', 'BGP network advertisement saved', 'success');
      loadDynamicRouting();
    } else {
      const err = await res.json();
      showToast('Error', err.error || 'Failed to save network', 'error');
    }
  } catch (err) {
    showToast('Error', err.message, 'error');
  }
}

async function deleteBgpNetwork(id) {
  if (!confirm('Are you sure you want to stop announcing this network?')) return;
  try {
    const res = await fetch(`${API_BASE}/routing/bgp/networks/${encodeURIComponent(id)}`, { method: 'DELETE' });
    if (res.ok) {
      showToast('Deleted', 'Network advertisement removed', 'success');
      loadDynamicRouting();
    }
  } catch (err) {
    showToast('Error', err.message, 'error');
  }
}

// =========================================================================
// DEBTIK v7 OSPF MODALS & ACTIONS
// =========================================================================

// --- 1. OSPF INSTANCE ---
function openOspfInstanceModal(id = null) {
  const isEdit = !!id;
  const inst = (state.ospfInstances || []).find(i => i.id === id) || {
    id: '',
    name: 'Default',
    version: 2,
    vrf: 'main',
    router_id: '192.168.131.56',
    routing_table: 'main',
    enabled: true,
    redistribute_connected: false,
    redistribute_static: true,
    redistribute_bgp: false,
    comment: ''
  };

  document.getElementById('ospf-instance-modal-title').innerText = isEdit ? inst.name : 'New...';
  document.getElementById('modal-ospf-inst-id').value = isEdit ? inst.id : '';
  document.getElementById('modal-ospf-inst-enabled').checked = !inst.disabled;
  document.getElementById('modal-ospf-inst-comment').value = inst.comment || '';
  document.getElementById('modal-ospf-inst-name').value = inst.name || 'Default';
  document.getElementById('modal-ospf-inst-version').value = inst.version || 2;
  document.getElementById('modal-ospf-inst-vrf').value = inst.vrf || 'main';
  document.getElementById('modal-ospf-inst-router-id').value = inst.router_id || '';
  document.getElementById('modal-ospf-inst-routing-table').value = inst.routing_table || 'main';
  document.getElementById('modal-ospf-inst-redist-conn').checked = !!inst.redistribute_connected;
  document.getElementById('modal-ospf-inst-redist-static').checked = inst.redistribute_static !== false;
  document.getElementById('modal-ospf-inst-redist-bgp').checked = !!inst.redistribute_bgp;

  const btnRem = document.getElementById('btn-ospf-inst-modal-remove');
  if (btnRem) btnRem.style.display = isEdit ? 'block' : 'none';

  document.getElementById('ospf-instance-modal').classList.remove('hidden');
}

function openEditOspfInstanceModal(id) {
  openOspfInstanceModal(id);
}

function closeOspfInstanceModal() {
  document.getElementById('ospf-instance-modal').classList.add('hidden');
}

async function submitOspfInstance(e) {
  if (e) e.preventDefault();
  const payload = {
    id: document.getElementById('modal-ospf-inst-id').value,
    name: document.getElementById('modal-ospf-inst-name').value.trim() || 'Default',
    version: parseInt(document.getElementById('modal-ospf-inst-version').value, 10) || 2,
    vrf: document.getElementById('modal-ospf-inst-vrf').value.trim() || 'main',
    router_id: document.getElementById('modal-ospf-inst-router-id').value.trim(),
    routing_table: document.getElementById('modal-ospf-inst-routing-table').value.trim() || 'main',
    enabled: document.getElementById('modal-ospf-inst-enabled').checked,
    disabled: !document.getElementById('modal-ospf-inst-enabled').checked,
    comment: document.getElementById('modal-ospf-inst-comment').value.trim(),
    redistribute_connected: document.getElementById('modal-ospf-inst-redist-conn').checked,
    redistribute_static: document.getElementById('modal-ospf-inst-redist-static').checked,
    redistribute_bgp: document.getElementById('modal-ospf-inst-redist-bgp').checked
  };

  try {
    const res = await fetch(`${API_BASE}/routing/ospf/instances`, {
      method: 'POST',
      headers: { 'Content-Type': 'application/json' },
      body: JSON.stringify(payload)
    });
    if (res.ok) {
      closeOspfInstanceModal();
      showToast('Saved', 'OSPF instance updated', 'success');
      loadDynamicRouting();
    } else {
      const err = await res.json();
      showToast('Error', err.error || 'Failed to save OSPF instance', 'error');
    }
  } catch (err) {
    showToast('Error', err.message, 'error');
  }
}

function applyOspfInstanceForm() {
  submitOspfInstance(null);
}

function copyOspfInstance() {
  document.getElementById('modal-ospf-inst-id').value = '';
  document.getElementById('modal-ospf-inst-name').value += '-copy';
  document.getElementById('ospf-instance-modal-title').innerText = 'New...';
  showToast('Copied', 'Duplicated as new OSPF instance', 'info');
}

async function deleteCurrentOspfInstance() {
  const id = document.getElementById('modal-ospf-inst-id').value;
  if (!id) return;
  if (!confirm('Are you sure you want to remove this OSPF instance?')) return;
  try {
    const res = await fetch(`${API_BASE}/routing/ospf/instances/${encodeURIComponent(id)}`, { method: 'DELETE' });
    if (res.ok) {
      closeOspfInstanceModal();
      showToast('Removed', 'OSPF instance deleted', 'success');
      loadDynamicRouting();
    }
  } catch (err) {
    showToast('Error', err.message, 'error');
  }
}

async function enableSelectedOspfInstance() {
  const id = state.selectedOspfRow?.instances;
  if (!id) return;
  await fetch(`${API_BASE}/routing/ospf/instances/${encodeURIComponent(id)}/state`, {
    method: 'POST',
    headers: { 'Content-Type': 'application/json' },
    body: JSON.stringify({ disabled: false })
  });
  loadDynamicRouting();
}

async function disableSelectedOspfInstance() {
  const id = state.selectedOspfRow?.instances;
  if (!id) return;
  await fetch(`${API_BASE}/routing/ospf/instances/${encodeURIComponent(id)}/state`, {
    method: 'POST',
    headers: { 'Content-Type': 'application/json' },
    body: JSON.stringify({ disabled: true })
  });
  loadDynamicRouting();
}

async function removeSelectedOspfInstance() {
  const id = state.selectedOspfRow?.instances;
  if (!id) return;
  if (!confirm('Delete selected OSPF instance?')) return;
  await fetch(`${API_BASE}/routing/ospf/instances/${encodeURIComponent(id)}`, { method: 'DELETE' });
  loadDynamicRouting();
}

async function promptCommentOspfInstance() {
  const id = state.selectedOspfRow?.instances;
  if (!id) return;
  const inst = (state.ospfInstances || []).find(i => i.id === id);
  if (!inst) return;
  const comment = prompt('Enter comment for OSPF instance:', inst.comment || '');
  if (comment === null) return;
  inst.comment = comment;
  await fetch(`${API_BASE}/routing/ospf/instances`, {
    method: 'POST',
    headers: { 'Content-Type': 'application/json' },
    body: JSON.stringify(inst)
  });
  loadDynamicRouting();
}

// --- 2. OSPF AREA ---
function populateOspfAreaDropdowns() {
  const instSelect = document.getElementById('modal-ospf-area-instance');
  if (instSelect) {
    const cur = instSelect.value;
    instSelect.innerHTML = (state.ospfInstances || []).map(i => `<option value="${escapeHtml(i.name)}">${escapeHtml(i.name)}</option>`).join('');
    if (instSelect.innerHTML === '') instSelect.innerHTML = '<option value="Default">Default</option>';
    if (cur) instSelect.value = cur;
  }
}

function openOspfAreaModal(id = null) {
  const isEdit = !!id;
  populateOspfAreaDropdowns();
  const area = (state.ospfAreas || []).find(a => a.id === id) || {
    id: '',
    name: 'Default',
    instance: 'Default',
    area_id: '0.0.0.0',
    area_type: 'default',
    default_cost: 1,
    no_summaries: false,
    disabled: false,
    comment: ''
  };

  document.getElementById('ospf-area-modal-title').innerText = isEdit ? area.name : 'New...';
  document.getElementById('modal-ospf-area-id').value = isEdit ? area.id : '';
  document.getElementById('modal-ospf-area-enabled').checked = !area.disabled;
  document.getElementById('modal-ospf-area-comment').value = area.comment || '';
  document.getElementById('modal-ospf-area-name').value = area.name || 'Default';
  document.getElementById('modal-ospf-area-instance').value = area.instance || 'Default';
  document.getElementById('modal-ospf-area-areaid').value = area.area_id || '0.0.0.0';
  document.getElementById('modal-ospf-area-type').value = area.area_type || 'default';
  document.getElementById('modal-ospf-area-default-cost').value = area.default_cost || 1;
  document.getElementById('modal-ospf-area-no-summaries').checked = !!area.no_summaries;

  const btnRem = document.getElementById('btn-ospf-area-modal-remove');
  if (btnRem) btnRem.style.display = isEdit ? 'block' : 'none';

  document.getElementById('ospf-area-modal').classList.remove('hidden');
}

function openEditOspfAreaModal(id) {
  openOspfAreaModal(id);
}

function closeOspfAreaModal() {
  document.getElementById('ospf-area-modal').classList.add('hidden');
}

async function submitOspfArea(e) {
  if (e) e.preventDefault();
  const payload = {
    id: document.getElementById('modal-ospf-area-id').value,
    name: document.getElementById('modal-ospf-area-name').value.trim() || 'Default',
    instance: document.getElementById('modal-ospf-area-instance').value.trim() || 'Default',
    area_id: document.getElementById('modal-ospf-area-areaid').value.trim() || '0.0.0.0',
    area_type: document.getElementById('modal-ospf-area-type').value,
    default_cost: parseInt(document.getElementById('modal-ospf-area-default-cost').value, 10) || 1,
    no_summaries: document.getElementById('modal-ospf-area-no-summaries').checked,
    disabled: !document.getElementById('modal-ospf-area-enabled').checked,
    comment: document.getElementById('modal-ospf-area-comment').value.trim()
  };

  try {
    const res = await fetch(`${API_BASE}/routing/ospf/areas`, {
      method: 'POST',
      headers: { 'Content-Type': 'application/json' },
      body: JSON.stringify(payload)
    });
    if (res.ok) {
      closeOspfAreaModal();
      showToast('Saved', 'OSPF area saved', 'success');
      loadDynamicRouting();
    } else {
      const err = await res.json();
      showToast('Error', err.error || 'Failed to save area', 'error');
    }
  } catch (err) {
    showToast('Error', err.message, 'error');
  }
}

function applyOspfAreaForm() {
  submitOspfArea(null);
}

function copyOspfArea() {
  document.getElementById('modal-ospf-area-id').value = '';
  document.getElementById('modal-ospf-area-name').value += '-copy';
  document.getElementById('ospf-area-modal-title').innerText = 'New...';
  showToast('Copied', 'Duplicated as new OSPF area', 'info');
}

async function deleteCurrentOspfArea() {
  const id = document.getElementById('modal-ospf-area-id').value;
  if (!id) return;
  if (!confirm('Are you sure you want to remove this OSPF area?')) return;
  try {
    const res = await fetch(`${API_BASE}/routing/ospf/areas/${encodeURIComponent(id)}`, { method: 'DELETE' });
    if (res.ok) {
      closeOspfAreaModal();
      showToast('Removed', 'OSPF area deleted', 'success');
      loadDynamicRouting();
    }
  } catch (err) {
    showToast('Error', err.message, 'error');
  }
}

async function enableSelectedOspfArea() {
  const id = state.selectedOspfRow?.areas;
  if (!id) return;
  await fetch(`${API_BASE}/routing/ospf/areas/${encodeURIComponent(id)}/state`, {
    method: 'POST',
    headers: { 'Content-Type': 'application/json' },
    body: JSON.stringify({ disabled: false })
  });
  loadDynamicRouting();
}

async function disableSelectedOspfArea() {
  const id = state.selectedOspfRow?.areas;
  if (!id) return;
  await fetch(`${API_BASE}/routing/ospf/areas/${encodeURIComponent(id)}/state`, {
    method: 'POST',
    headers: { 'Content-Type': 'application/json' },
    body: JSON.stringify({ disabled: true })
  });
  loadDynamicRouting();
}

async function removeSelectedOspfArea() {
  const id = state.selectedOspfRow?.areas;
  if (!id) return;
  if (!confirm('Delete selected OSPF area?')) return;
  await fetch(`${API_BASE}/routing/ospf/areas/${encodeURIComponent(id)}`, { method: 'DELETE' });
  loadDynamicRouting();
}

async function promptCommentOspfArea() {
  const id = state.selectedOspfRow?.areas;
  if (!id) return;
  const area = (state.ospfAreas || []).find(a => a.id === id);
  if (!area) return;
  const comment = prompt('Enter comment for OSPF area:', area.comment || '');
  if (comment === null) return;
  area.comment = comment;
  await fetch(`${API_BASE}/routing/ospf/areas`, {
    method: 'POST',
    headers: { 'Content-Type': 'application/json' },
    body: JSON.stringify(area)
  });
  loadDynamicRouting();
}

// --- 3. OSPF AREA RANGE ---
function populateAreaRangeDropdowns() {
  const select = document.getElementById('modal-ospf-range-area');
  if (select) {
    const cur = select.value;
    select.innerHTML = (state.ospfAreas || []).map(a => `<option value="${escapeHtml(a.name)}">${escapeHtml(a.name)}</option>`).join('');
    if (select.innerHTML === '') select.innerHTML = '<option value="Default">Default</option>';
    if (cur) select.value = cur;
  }
}

function openOspfAreaRangeModal(id = null) {
  const isEdit = !!id;
  populateAreaRangeDropdowns();
  const r = (state.ospfAreaRanges || []).find(it => it.id === id) || {
    id: '',
    area: 'Default',
    prefix: '',
    cost: 1,
    advertise: true,
    disabled: false,
    comment: ''
  };

  document.getElementById('ospf-area-range-modal-title').innerText = isEdit ? r.prefix : 'New...';
  document.getElementById('modal-ospf-range-id').value = isEdit ? r.id : '';
  document.getElementById('modal-ospf-range-enabled').checked = !r.disabled;
  document.getElementById('modal-ospf-range-comment').value = r.comment || '';
  document.getElementById('modal-ospf-range-area').value = r.area || 'Default';
  document.getElementById('modal-ospf-range-prefix').value = r.prefix || '';
  document.getElementById('modal-ospf-range-cost').value = r.cost || 1;
  document.getElementById('modal-ospf-range-advertise').checked = r.advertise !== false;

  const btnRem = document.getElementById('btn-ospf-range-modal-remove');
  if (btnRem) btnRem.style.display = isEdit ? 'block' : 'none';

  document.getElementById('ospf-area-range-modal').classList.remove('hidden');
}

function openEditOspfAreaRangeModal(id) {
  openOspfAreaRangeModal(id);
}

function closeOspfAreaRangeModal() {
  document.getElementById('ospf-area-range-modal').classList.add('hidden');
}

async function submitOspfAreaRange(e) {
  if (e) e.preventDefault();
  const payload = {
    id: document.getElementById('modal-ospf-range-id').value,
    area: document.getElementById('modal-ospf-range-area').value,
    prefix: document.getElementById('modal-ospf-range-prefix').value.trim(),
    cost: parseInt(document.getElementById('modal-ospf-range-cost').value, 10) || 1,
    advertise: document.getElementById('modal-ospf-range-advertise').checked,
    disabled: !document.getElementById('modal-ospf-range-enabled').checked,
    comment: document.getElementById('modal-ospf-range-comment').value.trim()
  };

  try {
    const res = await fetch(`${API_BASE}/routing/ospf/area-ranges`, {
      method: 'POST',
      headers: { 'Content-Type': 'application/json' },
      body: JSON.stringify(payload)
    });
    if (res.ok) {
      closeOspfAreaRangeModal();
      showToast('Saved', 'Area range saved', 'success');
      loadDynamicRouting();
    } else {
      const err = await res.json();
      showToast('Error', err.error || 'Failed to save area range', 'error');
    }
  } catch (err) {
    showToast('Error', err.message, 'error');
  }
}

function applyOspfAreaRangeForm() {
  submitOspfAreaRange(null);
}

async function deleteCurrentOspfAreaRange() {
  const id = document.getElementById('modal-ospf-range-id').value;
  if (!id) return;
  if (!confirm('Delete this area range?')) return;
  try {
    await fetch(`${API_BASE}/routing/ospf/area-ranges/${encodeURIComponent(id)}`, { method: 'DELETE' });
    closeOspfAreaRangeModal();
    showToast('Removed', 'Area range removed', 'success');
    loadDynamicRouting();
  } catch (err) {
    showToast('Error', err.message, 'error');
  }
}

async function enableSelectedOspfAreaRange() {
  const id = state.selectedOspfRow?.['area-ranges'];
  if (!id) return;
  const r = (state.ospfAreaRanges || []).find(it => it.id === id);
  if (!r) return;
  r.disabled = false;
  await fetch(`${API_BASE}/routing/ospf/area-ranges`, { method: 'POST', headers: { 'Content-Type': 'application/json' }, body: JSON.stringify(r) });
  loadDynamicRouting();
}

async function disableSelectedOspfAreaRange() {
  const id = state.selectedOspfRow?.['area-ranges'];
  if (!id) return;
  const r = (state.ospfAreaRanges || []).find(it => it.id === id);
  if (!r) return;
  r.disabled = true;
  await fetch(`${API_BASE}/routing/ospf/area-ranges`, { method: 'POST', headers: { 'Content-Type': 'application/json' }, body: JSON.stringify(r) });
  loadDynamicRouting();
}

async function removeSelectedOspfAreaRange() {
  const id = state.selectedOspfRow?.['area-ranges'];
  if (!id) return;
  if (!confirm('Delete selected area range?')) return;
  await fetch(`${API_BASE}/routing/ospf/area-ranges/${encodeURIComponent(id)}`, { method: 'DELETE' });
  loadDynamicRouting();
}

async function promptCommentOspfAreaRange() {
  const id = state.selectedOspfRow?.['area-ranges'];
  if (!id) return;
  const r = (state.ospfAreaRanges || []).find(it => it.id === id);
  if (!r) return;
  const comment = prompt('Enter comment for area range:', r.comment || '');
  if (comment === null) return;
  r.comment = comment;
  await fetch(`${API_BASE}/routing/ospf/area-ranges`, { method: 'POST', headers: { 'Content-Type': 'application/json' }, body: JSON.stringify(r) });
  loadDynamicRouting();
}

// --- 4. OSPF INTERFACE TEMPLATE ---
function switchOspfTemplateTab(tab) {
  const tabGen = document.getElementById('ospf-tmpl-tab-general');
  const tabAuth = document.getElementById('ospf-tmpl-tab-auth');
  const btnGen = document.getElementById('ospf-tmpl-tab-btn-general');
  const btnAuth = document.getElementById('ospf-tmpl-tab-btn-auth');

  if (tab === 'general') {
    if (tabGen) tabGen.classList.remove('hidden');
    if (tabAuth) tabAuth.classList.add('hidden');
    if (btnGen) btnGen.className = 'px-4 py-2 text-xs font-bold border-b-2 border-sky-500 text-white transition';
    if (btnAuth) btnAuth.className = 'px-4 py-2 text-xs font-bold border-b-2 border-transparent text-slate-400 hover:text-slate-200 transition';
  } else {
    if (tabGen) tabGen.classList.add('hidden');
    if (tabAuth) tabAuth.classList.remove('hidden');
    if (btnGen) btnGen.className = 'px-4 py-2 text-xs font-bold border-b-2 border-transparent text-slate-400 hover:text-slate-200 transition';
    if (btnAuth) btnAuth.className = 'px-4 py-2 text-xs font-bold border-b-2 border-sky-500 text-white transition';
  }
}

function populateTemplateAreaDropdowns() {
  const select = document.getElementById('modal-ospf-tmpl-area');
  if (select) {
    const cur = select.value;
    select.innerHTML = (state.ospfAreas || []).map(a => `<option value="${escapeHtml(a.name)}">${escapeHtml(a.name)}</option>`).join('');
    if (select.innerHTML === '') select.innerHTML = '<option value="Default">Default</option>';
    if (cur) select.value = cur;
  }
}

function openOspfTemplateModal(id = null) {
  const isEdit = !!id;
  populateTemplateAreaDropdowns();
  switchOspfTemplateTab('general');

  const tmpl = (state.ospfTemplates || []).find(t => t.id === id) || {
    id: '',
    interfaces: '',
    area: 'Default',
    networks: '',
    network_type: 'broadcast',
    cost: 1,
    priority: 128,
    passive: false,
    hello_interval: 10,
    dead_interval: 40,
    auth: 'none',
    auth_key: '',
    disabled: false,
    comment: ''
  };

  document.getElementById('ospf-template-modal-title').innerText = isEdit ? (tmpl.interfaces || tmpl.networks || 'Template') : 'New...';
  document.getElementById('modal-ospf-tmpl-id').value = isEdit ? tmpl.id : '';
  document.getElementById('modal-ospf-tmpl-enabled').checked = !tmpl.disabled;
  document.getElementById('modal-ospf-tmpl-comment').value = tmpl.comment || '';
  document.getElementById('modal-ospf-tmpl-interfaces').value = tmpl.interfaces || tmpl.interface || '';
  document.getElementById('modal-ospf-tmpl-area').value = tmpl.area || 'Default';
  document.getElementById('modal-ospf-tmpl-networks').value = tmpl.networks || tmpl.network || '';
  document.getElementById('modal-ospf-tmpl-net-type').value = tmpl.network_type || 'broadcast';
  document.getElementById('modal-ospf-tmpl-cost').value = tmpl.cost || 1;
  document.getElementById('modal-ospf-tmpl-priority').value = tmpl.priority || 128;
  document.getElementById('modal-ospf-tmpl-passive').checked = !!tmpl.passive;
  document.getElementById('modal-ospf-tmpl-hello').value = tmpl.hello_interval || 10;
  document.getElementById('modal-ospf-tmpl-dead').value = tmpl.dead_interval || 40;
  document.getElementById('modal-ospf-tmpl-auth').value = tmpl.auth || tmpl.auth_type || 'none';
  document.getElementById('modal-ospf-tmpl-auth-key').value = tmpl.auth_key || '';

  const btnRem = document.getElementById('btn-ospf-tmpl-modal-remove');
  if (btnRem) btnRem.style.display = isEdit ? 'block' : 'none';

  document.getElementById('ospf-template-modal').classList.remove('hidden');
}

function openEditOspfTemplateModal(id) {
  openOspfTemplateModal(id);
}

function closeOspfTemplateModal() {
  document.getElementById('ospf-template-modal').classList.add('hidden');
}

async function submitOspfTemplate(e) {
  if (e) e.preventDefault();
  const payload = {
    id: document.getElementById('modal-ospf-tmpl-id').value,
    interfaces: document.getElementById('modal-ospf-tmpl-interfaces').value.trim(),
    interface: document.getElementById('modal-ospf-tmpl-interfaces').value.trim(),
    area: document.getElementById('modal-ospf-tmpl-area').value,
    networks: document.getElementById('modal-ospf-tmpl-networks').value.trim(),
    network: document.getElementById('modal-ospf-tmpl-networks').value.trim(),
    network_type: document.getElementById('modal-ospf-tmpl-net-type').value,
    cost: parseInt(document.getElementById('modal-ospf-tmpl-cost').value, 10) || 1,
    priority: parseInt(document.getElementById('modal-ospf-tmpl-priority').value, 10) || 128,
    passive: document.getElementById('modal-ospf-tmpl-passive').checked,
    hello_interval: parseInt(document.getElementById('modal-ospf-tmpl-hello').value, 10) || 10,
    dead_interval: parseInt(document.getElementById('modal-ospf-tmpl-dead').value, 10) || 40,
    auth: document.getElementById('modal-ospf-tmpl-auth').value,
    auth_type: document.getElementById('modal-ospf-tmpl-auth').value,
    auth_key: document.getElementById('modal-ospf-tmpl-auth-key').value,
    disabled: !document.getElementById('modal-ospf-tmpl-enabled').checked,
    comment: document.getElementById('modal-ospf-tmpl-comment').value.trim()
  };

  try {
    const res = await fetch(`${API_BASE}/routing/ospf/templates`, {
      method: 'POST',
      headers: { 'Content-Type': 'application/json' },
      body: JSON.stringify(payload)
    });
    if (res.ok) {
      closeOspfTemplateModal();
      showToast('Saved', 'Interface template saved', 'success');
      loadDynamicRouting();
    } else {
      const err = await res.json();
      showToast('Error', err.error || 'Failed to save interface template', 'error');
    }
  } catch (err) {
    showToast('Error', err.message, 'error');
  }
}

function applyOspfTemplateForm() {
  submitOspfTemplate(null);
}

function copyOspfTemplate() {
  document.getElementById('modal-ospf-tmpl-id').value = '';
  document.getElementById('ospf-template-modal-title').innerText = 'New...';
  showToast('Copied', 'Duplicated as new template', 'info');
}

async function deleteCurrentOspfTemplate() {
  const id = document.getElementById('modal-ospf-tmpl-id').value;
  if (!id) return;
  if (!confirm('Delete this interface template?')) return;
  try {
    await fetch(`${API_BASE}/routing/ospf/templates/${encodeURIComponent(id)}`, { method: 'DELETE' });
    closeOspfTemplateModal();
    showToast('Removed', 'Interface template deleted', 'success');
    loadDynamicRouting();
  } catch (err) {
    showToast('Error', err.message, 'error');
  }
}

async function enableSelectedOspfTemplate() {
  const id = state.selectedOspfRow?.templates;
  if (!id) return;
  await fetch(`${API_BASE}/routing/ospf/templates/${encodeURIComponent(id)}/state`, {
    method: 'POST',
    headers: { 'Content-Type': 'application/json' },
    body: JSON.stringify({ disabled: false })
  });
  loadDynamicRouting();
}

async function disableSelectedOspfTemplate() {
  const id = state.selectedOspfRow?.templates;
  if (!id) return;
  await fetch(`${API_BASE}/routing/ospf/templates/${encodeURIComponent(id)}/state`, {
    method: 'POST',
    headers: { 'Content-Type': 'application/json' },
    body: JSON.stringify({ disabled: true })
  });
  loadDynamicRouting();
}

async function removeSelectedOspfTemplate() {
  const id = state.selectedOspfRow?.templates;
  if (!id) return;
  if (!confirm('Delete selected interface template?')) return;
  await fetch(`${API_BASE}/routing/ospf/templates/${encodeURIComponent(id)}`, { method: 'DELETE' });
  loadDynamicRouting();
}

async function promptCommentOspfTemplate() {
  const id = state.selectedOspfRow?.templates;
  if (!id) return;
  const tmpl = (state.ospfTemplates || []).find(t => t.id === id);
  if (!tmpl) return;
  const comment = prompt('Enter comment for template:', tmpl.comment || '');
  if (comment === null) return;
  tmpl.comment = comment;
  await fetch(`${API_BASE}/routing/ospf/templates`, {
    method: 'POST',
    headers: { 'Content-Type': 'application/json' },
    body: JSON.stringify(tmpl)
  });
  loadDynamicRouting();
}

// --- 5. OSPF STATIC NEIGHBOR ---
function populateStaticNbrAreaDropdowns() {
  const select = document.getElementById('modal-ospf-snbr-area');
  if (select) {
    const cur = select.value;
    select.innerHTML = (state.ospfAreas || []).map(a => `<option value="${escapeHtml(a.name)}">${escapeHtml(a.name)}</option>`).join('');
    if (select.innerHTML === '') select.innerHTML = '<option value="Default">Default</option>';
    if (cur) select.value = cur;
  }
}

function openOspfStaticNbrModal(id = null) {
  const isEdit = !!id;
  populateStaticNbrAreaDropdowns();
  const nbr = (state.ospfStaticNbrs || []).find(n => n.id === id) || {
    id: '',
    address: '',
    area: 'Default',
    poll_interval: 120,
    cost: 1,
    disabled: false,
    comment: ''
  };

  document.getElementById('ospf-static-nbr-modal-title').innerText = isEdit ? nbr.address : 'New...';
  document.getElementById('modal-ospf-snbr-id').value = isEdit ? nbr.id : '';
  document.getElementById('modal-ospf-snbr-enabled').checked = !nbr.disabled;
  document.getElementById('modal-ospf-snbr-comment').value = nbr.comment || '';
  document.getElementById('modal-ospf-snbr-address').value = nbr.address || '';
  document.getElementById('modal-ospf-snbr-area').value = nbr.area || 'Default';
  document.getElementById('modal-ospf-snbr-poll').value = nbr.poll_interval || 120;
  document.getElementById('modal-ospf-snbr-cost').value = nbr.cost || 1;

  const btnRem = document.getElementById('btn-ospf-snbr-modal-remove');
  if (btnRem) btnRem.style.display = isEdit ? 'block' : 'none';

  document.getElementById('ospf-static-nbr-modal').classList.remove('hidden');
}

function openEditOspfStaticNbrModal(id) {
  openOspfStaticNbrModal(id);
}

function closeOspfStaticNbrModal() {
  document.getElementById('ospf-static-nbr-modal').classList.add('hidden');
}

async function submitOspfStaticNbr(e) {
  if (e) e.preventDefault();
  const payload = {
    id: document.getElementById('modal-ospf-snbr-id').value,
    address: document.getElementById('modal-ospf-snbr-address').value.trim(),
    area: document.getElementById('modal-ospf-snbr-area').value,
    poll_interval: parseInt(document.getElementById('modal-ospf-snbr-poll').value, 10) || 120,
    cost: parseInt(document.getElementById('modal-ospf-snbr-cost').value, 10) || 1,
    disabled: !document.getElementById('modal-ospf-snbr-enabled').checked,
    comment: document.getElementById('modal-ospf-snbr-comment').value.trim()
  };

  try {
    const res = await fetch(`${API_BASE}/routing/ospf/static-neighbors`, {
      method: 'POST',
      headers: { 'Content-Type': 'application/json' },
      body: JSON.stringify(payload)
    });
    if (res.ok) {
      closeOspfStaticNbrModal();
      showToast('Saved', 'Static neighbor saved', 'success');
      loadDynamicRouting();
    } else {
      const err = await res.json();
      showToast('Error', err.error || 'Failed to save static neighbor', 'error');
    }
  } catch (err) {
    showToast('Error', err.message, 'error');
  }
}

function applyOspfStaticNbrForm() {
  submitOspfStaticNbr(null);
}

async function deleteCurrentOspfStaticNbr() {
  const id = document.getElementById('modal-ospf-snbr-id').value;
  if (!id) return;
  if (!confirm('Delete this static neighbor?')) return;
  try {
    await fetch(`${API_BASE}/routing/ospf/static-neighbors/${encodeURIComponent(id)}`, { method: 'DELETE' });
    closeOspfStaticNbrModal();
    showToast('Removed', 'Static neighbor removed', 'success');
    loadDynamicRouting();
  } catch (err) {
    showToast('Error', err.message, 'error');
  }
}

async function enableSelectedOspfStaticNbr() {
  const id = state.selectedOspfRow?.['static-nbrs'];
  if (!id) return;
  const n = (state.ospfStaticNbrs || []).find(it => it.id === id);
  if (!n) return;
  n.disabled = false;
  await fetch(`${API_BASE}/routing/ospf/static-neighbors`, { method: 'POST', headers: { 'Content-Type': 'application/json' }, body: JSON.stringify(n) });
  loadDynamicRouting();
}

async function disableSelectedOspfStaticNbr() {
  const id = state.selectedOspfRow?.['static-nbrs'];
  if (!id) return;
  const n = (state.ospfStaticNbrs || []).find(it => it.id === id);
  if (!n) return;
  n.disabled = true;
  await fetch(`${API_BASE}/routing/ospf/static-neighbors`, { method: 'POST', headers: { 'Content-Type': 'application/json' }, body: JSON.stringify(n) });
  loadDynamicRouting();
}

async function removeSelectedOspfStaticNbr() {
  const id = state.selectedOspfRow?.['static-nbrs'];
  if (!id) return;
  if (!confirm('Delete selected static neighbor?')) return;
  await fetch(`${API_BASE}/routing/ospf/static-neighbors/${encodeURIComponent(id)}`, { method: 'DELETE' });
  loadDynamicRouting();
}

async function promptCommentOspfStaticNbr() {
  const id = state.selectedOspfRow?.['static-nbrs'];
  if (!id) return;
  const n = (state.ospfStaticNbrs || []).find(it => it.id === id);
  if (!n) return;
  const comment = prompt('Enter comment for static neighbor:', n.comment || '');
  if (comment === null) return;
  n.comment = comment;
  await fetch(`${API_BASE}/routing/ospf/static-neighbors`, { method: 'POST', headers: { 'Content-Type': 'application/json' }, body: JSON.stringify(n) });
  loadDynamicRouting();
}

// Backward-compat aliases
function openAddOspfInterfaceModal() { openOspfTemplateModal(); }
function openEditOspfInterfaceModal(id) { openEditOspfTemplateModal(id); }
function closeOspfInterfaceModal() { closeOspfTemplateModal(); }
function submitOspfInterface(e) { submitOspfTemplate(e); }
function deleteOspfInterface(id) {
  fetch(`${API_BASE}/routing/ospf/templates/${encodeURIComponent(id)}`, { method: 'DELETE' }).then(() => loadDynamicRouting());
}
function toggleOspfInterfaceState(id, disabled) {
  fetch(`${API_BASE}/routing/ospf/templates/${encodeURIComponent(id)}/state`, {
    method: 'POST',
    headers: { 'Content-Type': 'application/json' },
    body: JSON.stringify({ disabled })
  }).then(() => loadDynamicRouting());
}
function openAddOspfAreaModal() { openOspfAreaModal(); }
function deleteOspfArea(id) {
  fetch(`${API_BASE}/routing/ospf/areas/${encodeURIComponent(id)}`, { method: 'DELETE' }).then(() => loadDynamicRouting());
}

// ============================================================================
// ==================== MIKROTIK BRIDGE SUBSYSTEM ==============================
// ============================================================================

function switchBridgeSubTab(tab) {
  state.bridgeSubTab = tab;
  const tabs = ['bridges', 'ports', 'vlans', 'hosts'];
  tabs.forEach(t => {
    const panel = document.getElementById(`bridge-subtab-${t}`);
    const btn = document.getElementById(`bridge-subtab-btn-${t}`);
    if (panel) {
      if (t === tab) panel.classList.remove('hidden');
      else panel.classList.add('hidden');
    }
    if (btn) {
      if (t === tab) {
        btn.className = 'px-4 py-2 text-xs font-bold rounded-lg bg-slate-800 text-white shadow-sm transition flex items-center gap-2';
      } else {
        btn.className = 'px-4 py-2 text-xs font-bold rounded-lg text-slate-400 hover:text-slate-200 transition flex items-center gap-2';
      }
    }
  });

  const addBtn = document.getElementById('bridge-top-action-btn');
  if (addBtn) {
    if (tab === 'bridges') addBtn.innerHTML = '<span>+ Add Bridge</span>';
    else if (tab === 'ports') addBtn.innerHTML = '<span>+ Add Port</span>';
    else if (tab === 'vlans') addBtn.innerHTML = '<span>+ Add VLAN Entry</span>';
    else if (tab === 'hosts') addBtn.innerHTML = '<span>🔄 Refresh MACs</span>';
  }

  if (tab === 'hosts') loadBridgeHosts();
  setTimeout(initTableSorting, 50);
}

function openCurrentBridgeModal() {
  if (state.bridgeSubTab === 'bridges') openAddBridgeModal();
  else if (state.bridgeSubTab === 'ports') openAddBridgePortModal();
  else if (state.bridgeSubTab === 'vlans') openAddBridgeVLANModal();
  else if (state.bridgeSubTab === 'hosts') loadBridgeHosts();
}

async function loadBridge() {
  try {
    const [bridgesRes, portsRes, vlansRes, summaryRes, eoipRes, vxlanRes, vlanIfacesRes] = await Promise.all([
      fetch(`${API_BASE}/bridge/bridges`),
      fetch(`${API_BASE}/bridge/ports`),
      fetch(`${API_BASE}/bridge/vlans`),
      fetch(`${API_BASE}/bridge/summary`),
      fetch(`${API_BASE}/vpn/eoip`),
      fetch(`${API_BASE}/vpn/vxlan`),
      fetch(`${API_BASE}/vlans`)
    ]);

    if (bridgesRes.ok) state.bridges = await bridgesRes.json();
    if (portsRes.ok) state.bridgePorts = await portsRes.json();
    if (vlansRes.ok) state.bridgeVLANs = await vlansRes.json();
    if (summaryRes.ok) state.bridgeSummary = await summaryRes.json();
    if (eoipRes && eoipRes.ok) state.eoipTunnels = await eoipRes.json();
    if (vxlanRes && vxlanRes.ok) state.vxlanTunnels = await vxlanRes.json();
    if (vlanIfacesRes && vlanIfacesRes.ok) state.vlans = await vlanIfacesRes.json();

    // Badges & Stats
    const bBridges = document.getElementById('bridge-badge-bridges');
    if (bBridges) bBridges.innerText = (state.bridges || []).length;
    const bPorts = document.getElementById('bridge-badge-ports');
    if (bPorts) bPorts.innerText = (state.bridgePorts || []).length;
    const bVlans = document.getElementById('bridge-badge-vlans');
    if (bVlans) bVlans.innerText = (state.bridgeVLANs || []).length;
    const bHosts = document.getElementById('bridge-badge-hosts');
    if (bHosts) bHosts.innerText = state.bridgeSummary?.hosts_count || 0;

    const sBr = document.getElementById('bridge-stat-bridges');
    if (sBr) sBr.innerText = (state.bridges || []).length;
    const sPorts = document.getElementById('bridge-stat-ports');
    if (sPorts) sPorts.innerText = (state.bridgePorts || []).length;
    const sHosts = document.getElementById('bridge-stat-hosts');
    if (sHosts) sHosts.innerText = state.bridgeSummary?.hosts_count || 0;

    renderBridges();
    renderBridgePorts();
    renderBridgeVLANs();

    if (state.bridgeSubTab === 'hosts') loadBridgeHosts();
  } catch (err) {
    console.error('Failed to load bridge subsystem:', err);
  }
}

// ----------------- Bridges -----------------

function renderBridges() {
  const tbody = document.getElementById('bridge-table-body');
  const empty = document.getElementById('bridge-empty-bridges');
  const countBadge = document.getElementById('bridge-count-badge');
  if (!tbody) return;
  tbody.innerHTML = '';

  const bridges = state.bridges || [];
  if (countBadge) countBadge.innerText = `${bridges.length} Bridges`;

  if (bridges.length === 0) {
    empty?.classList.remove('hidden');
    return;
  }
  empty?.classList.add('hidden');

  bridges.forEach((b, idx) => {
    const tr = document.createElement('tr');
    tr.className = `hover:bg-slate-800/40 transition text-xs ${b.disabled ? 'opacity-50' : ''}`;

    // Format IP addresses pill list
    let ipsHtml = '<span class="text-slate-600 font-sans">None</span>';
    if (b.ip_addresses && b.ip_addresses.length > 0) {
      ipsHtml = b.ip_addresses.map(ip => `
        <span class="inline-flex items-center gap-1 px-1.5 py-0.5 rounded text-[10px] font-mono bg-sky-950/80 border border-sky-800/40 text-sky-300">
          <span>${ip}</span>
          <button onclick="deleteBridgeIP('${b.id}', '${ip}')" class="text-slate-500 hover:text-rose-400 font-bold ml-0.5">×</button>
        </span>
      `).join(' ');
    }

    const runningFlag = b.running ? '<span class="text-emerald-400 font-bold" title="Running (R)">R</span>' : '<span class="text-slate-600">-</span>';
    const disabledFlag = b.disabled ? '<span class="text-rose-400 font-bold" title="Disabled (X)">X</span>' : '';
    const flagDisplay = `${runningFlag}${disabledFlag ? ' ' + disabledFlag : ''}`;

    tr.innerHTML = `
      <td class="py-2.5 px-3 text-center text-slate-500 font-bold">${idx + 1}</td>
      <td class="py-2.5 px-3 text-center font-mono">${flagDisplay}</td>
      <td class="py-2.5 px-3 font-bold text-white text-sm">
        <span class="text-sky-400 mr-1.5">🌉</span>${b.name}
      </td>
      <td class="py-2.5 px-3 text-slate-300">${b.mtu}</td>
      <td class="py-2.5 px-3 font-mono text-slate-300 text-[11px]">${b.mac_address || '-'}</td>
      <td class="py-2.5 px-3">
        <span class="px-1.5 py-0.5 rounded text-[10px] font-bold ${b.stp === 'none' ? 'bg-slate-800 text-slate-400' : 'bg-sky-950 text-sky-300 border border-sky-800/40'} uppercase">${b.stp}</span>
      </td>
      <td class="py-2.5 px-3 text-center">
        ${b.vlan_filtering ? '<span class="text-emerald-400 font-bold">yes</span>' : '<span class="text-slate-500">no</span>'}
      </td>
      <td class="py-2.5 px-3 font-mono">${b.pvid || 1}</td>
      <td class="py-2.5 px-3">
        <span class="px-2 py-0.5 rounded-full text-[10px] font-bold ${b.ports_count > 0 ? 'bg-sky-950 text-sky-400 border border-sky-800/40' : 'bg-slate-800 text-slate-500'} font-mono">${b.ports_count}</span>
      </td>
      <td class="py-2.5 px-3">
        <div class="flex items-center gap-1.5 flex-wrap">
          ${ipsHtml}
          <button onclick="openAddBridgeIPModal('${b.id}', '${b.name}')" class="px-1.5 py-0.2 rounded text-[10px] bg-slate-800 hover:bg-slate-700 text-slate-300 border border-slate-700 font-sans" title="Add IP to Bridge">+ IP</button>
        </div>
      </td>
      <td class="py-2.5 px-3 text-[11px] text-slate-400">
        <span class="text-emerald-400">↓ ${b.rx_human || '0 B'}</span> / <span class="text-cyan-400">↑ ${b.tx_human || '0 B'}</span>
      </td>
      <td class="py-2.5 px-3 text-slate-400 italic truncate max-w-[120px]" title="${b.comment || ''}">${b.comment || '-'}</td>
      <td class="py-2.5 px-3 text-right space-x-1.5 font-sans whitespace-nowrap">
        <button onclick="toggleBridgeState('${b.id}', ${!b.disabled})" class="text-xs ${b.disabled ? 'text-emerald-400' : 'text-slate-400'} hover:underline font-semibold">${b.disabled ? 'Enable' : 'Disable'}</button>
        <button onclick="openEditBridgeModal('${b.id}')" class="text-xs text-slate-400 hover:text-white">Edit</button>
        <button onclick="deleteBridge('${b.id}')" class="text-xs text-slate-500 hover:text-rose-400">Delete</button>
      </td>
    `;
    tbody.appendChild(tr);
  });
}

function openAddBridgeModal() {
  document.getElementById('bridge-modal-title').innerText = 'Add Bridge Interface';
  document.getElementById('bridge-modal-id').value = '';
  document.getElementById('bridge-modal-name').value = 'bridge1';
  document.getElementById('bridge-modal-name').disabled = false;
  document.getElementById('bridge-modal-mtu').value = '1500';
  document.getElementById('bridge-modal-mac').value = '';
  document.getElementById('bridge-modal-stp').value = 'stp';
  document.getElementById('bridge-modal-priority').value = '32768';
  document.getElementById('bridge-modal-vlanfiltering').checked = false;
  document.getElementById('bridge-modal-pvid').value = '1';
  document.getElementById('bridge-modal-fastforward').checked = true;
  document.getElementById('bridge-modal-comment').value = '';
  document.getElementById('bridge-modal-disabled').checked = false;
  toggleBridgeModalVlanFiltering();
  document.getElementById('bridge-modal').classList.remove('hidden');
}

function openEditBridgeModal(id) {
  const b = (state.bridges || []).find(x => x.id === id);
  if (!b) return;

  document.getElementById('bridge-modal-title').innerText = `Edit Bridge (${b.name})`;
  document.getElementById('bridge-modal-id').value = b.id;
  document.getElementById('bridge-modal-name').value = b.name;
  document.getElementById('bridge-modal-name').disabled = true;
  document.getElementById('bridge-modal-mtu').value = b.mtu || 1500;
  document.getElementById('bridge-modal-mac').value = b.mac_address || '';
  document.getElementById('bridge-modal-stp').value = b.stp || 'stp';
  document.getElementById('bridge-modal-priority').value = b.priority || 32768;
  document.getElementById('bridge-modal-vlanfiltering').checked = !!b.vlan_filtering;
  document.getElementById('bridge-modal-pvid').value = b.pvid || 1;
  document.getElementById('bridge-modal-fastforward').checked = b.fast_forward !== false;
  document.getElementById('bridge-modal-comment').value = b.comment || '';
  document.getElementById('bridge-modal-disabled').checked = !!b.disabled;
  toggleBridgeModalVlanFiltering();
  document.getElementById('bridge-modal').classList.remove('hidden');
}

function closeBridgeModal() {
  document.getElementById('bridge-modal').classList.add('hidden');
}

function toggleBridgeModalVlanFiltering() {
  const chk = document.getElementById('bridge-modal-vlanfiltering').checked;
  const pvidBox = document.getElementById('bridge-modal-pvid-box');
  if (pvidBox) {
    if (chk) pvidBox.classList.remove('opacity-40');
    else pvidBox.classList.add('opacity-40');
  }
}

async function submitSaveBridge(e) {
  e.preventDefault();
  const id = document.getElementById('bridge-modal-id').value;
  const name = document.getElementById('bridge-modal-name').value.trim();
  const mtu = parseInt(document.getElementById('bridge-modal-mtu').value, 10) || 1500;
  const mac = document.getElementById('bridge-modal-mac').value.trim();
  const stp = document.getElementById('bridge-modal-stp').value;
  const priority = parseInt(document.getElementById('bridge-modal-priority').value, 10) || 32768;
  const vlanFiltering = document.getElementById('bridge-modal-vlanfiltering').checked;
  const pvid = parseInt(document.getElementById('bridge-modal-pvid').value, 10) || 1;
  const fastForward = document.getElementById('bridge-modal-fastforward').checked;
  const comment = document.getElementById('bridge-modal-comment').value.trim();
  const disabled = document.getElementById('bridge-modal-disabled').checked;

  try {
    const res = await fetch(`${API_BASE}/bridge/bridges`, {
      method: 'POST',
      headers: { 'Content-Type': 'application/json' },
      body: JSON.stringify({
        id,
        name,
        mtu,
        mac_address: mac,
        stp,
        priority,
        vlan_filtering: vlanFiltering,
        pvid,
        fast_forward: fastForward,
        comment,
        disabled
      })
    });
    if (res.ok) {
      showToast('Bridge Saved', `Bridge ${name} configured`, 'success');
      closeBridgeModal();
      loadBridge();
      fetchData(false);
    } else {
      const err = await res.json();
      showToast('Error', err.error || err.message || 'Failed to save bridge', 'error');
    }
  } catch (err) {
    showToast('Error', err.message, 'error');
  }
}

async function toggleBridgeState(id, disabled) {
  try {
    const res = await fetch(`${API_BASE}/bridge/bridges/${encodeURIComponent(id)}/state`, {
      method: 'POST',
      headers: { 'Content-Type': 'application/json' },
      body: JSON.stringify({ disabled })
    });
    if (res.ok) {
      loadBridge();
      fetchData(false);
    }
  } catch (err) {
    showToast('Error', err.message, 'error');
  }
}

async function deleteBridge(id) {
  const b = (state.bridges || []).find(x => x.id === id);
  const name = b ? b.name : id;
  if (!confirm(`Are you sure you want to delete bridge '${name}'? All member ports will be detached.`)) return;

  try {
    const res = await fetch(`${API_BASE}/bridge/bridges/${encodeURIComponent(id)}`, { method: 'DELETE' });
    if (res.ok) {
      showToast('Deleted', `Bridge ${name} deleted`, 'success');
      loadBridge();
      fetchData(false);
    } else {
      const err = await res.json();
      showToast('Error', err.error || err.message || 'Failed to delete bridge', 'error');
    }
  } catch (err) {
    showToast('Error', err.message, 'error');
  }
}

// ----------------- Bridge IP Assignments -----------------

function openAddBridgeIPModal(id, name) {
  document.getElementById('bridge-ip-modal-id').value = id;
  document.getElementById('bridge-ip-modal-sub').innerText = name;
  document.getElementById('bridge-ip-modal-cidr').value = '';
  document.getElementById('bridge-ip-modal').classList.remove('hidden');
}

function closeBridgeIPModal() {
  document.getElementById('bridge-ip-modal').classList.add('hidden');
}

async function submitAddBridgeIP(e) {
  e.preventDefault();
  const id = document.getElementById('bridge-ip-modal-id').value;
  const ip = document.getElementById('bridge-ip-modal-cidr').value.trim();

  try {
    const res = await fetch(`${API_BASE}/bridge/bridges/${encodeURIComponent(id)}/ip`, {
      method: 'POST',
      headers: { 'Content-Type': 'application/json' },
      body: JSON.stringify({ ip })
    });
    if (res.ok) {
      showToast('IP Assigned', `${ip} assigned to bridge`, 'success');
      closeBridgeIPModal();
      loadBridge();
      fetchData(false);
    } else {
      const err = await res.json();
      showToast('Error', err.error || err.message || 'Failed to add IP', 'error');
    }
  } catch (err) {
    showToast('Error', err.message, 'error');
  }
}

async function deleteBridgeIP(id, ip) {
  if (!confirm(`Remove IP address ${ip} from bridge?`)) return;
  try {
    const res = await fetch(`${API_BASE}/bridge/bridges/${encodeURIComponent(id)}/ip`, {
      method: 'DELETE',
      headers: { 'Content-Type': 'application/json' },
      body: JSON.stringify({ ip })
    });
    if (res.ok) {
      showToast('IP Removed', `${ip} removed from bridge`, 'success');
      loadBridge();
      fetchData(false);
    }
  } catch (err) {
    showToast('Error', err.message, 'error');
  }
}

// ----------------- Bridge Ports -----------------

function renderBridgePorts() {
  const tbody = document.getElementById('bridge-ports-table-body');
  const empty = document.getElementById('bridge-empty-ports');
  const countBadge = document.getElementById('bridge-ports-count-badge');
  const filterBridge = document.getElementById('bridge-ports-filter-bridge')?.value || '';
  if (!tbody) return;
  tbody.innerHTML = '';

  // Update filter select
  populateBridgeSelect('bridge-ports-filter-bridge', filterBridge, true);

  const ports = (state.bridgePorts || []).filter(p => !filterBridge || p.bridge === filterBridge);
  if (countBadge) countBadge.innerText = `${ports.length} Ports`;

  if (ports.length === 0) {
    empty?.classList.remove('hidden');
    return;
  }
  empty?.classList.add('hidden');

  ports.forEach((p, idx) => {
    const tr = document.createElement('tr');
    tr.className = `hover:bg-slate-800/40 transition text-xs ${p.disabled ? 'opacity-50' : ''}`;

    const disabledFlag = p.disabled ? '<span class="text-rose-400 font-bold" title="Disabled (X)">X</span>' : '<span class="text-slate-600">-</span>';

    tr.innerHTML = `
      <td class="py-2.5 px-3 text-center text-slate-500 font-bold">${idx + 1}</td>
      <td class="py-2.5 px-3 text-center font-mono">${disabledFlag}</td>
      <td class="py-2.5 px-3 font-bold text-white text-sm">
        <span class="text-emerald-400 mr-1.5">🔌</span>${p.interface}
      </td>
      <td class="py-2.5 px-3 font-semibold text-sky-400">${p.bridge}</td>
      <td class="py-2.5 px-3 font-mono">${p.pvid || 1}</td>
      <td class="py-2.5 px-3 text-slate-300">${p.frame_types}</td>
      <td class="py-2.5 px-3 text-center">${p.ingress_filtering ? '<span class="text-amber-400 font-bold">yes</span>' : '<span class="text-slate-500">no</span>'}</td>
      <td class="py-2.5 px-3">
        ${p.horizon > 0 ? `<span class="px-1.5 py-0.5 rounded text-[10px] bg-purple-950 text-purple-300 border border-purple-800/40 font-mono">domain ${p.horizon}</span>` : '<span class="text-slate-500">none</span>'}
      </td>
      <td class="py-2.5 px-3">
        <span class="px-2 py-0.5 rounded text-[10px] font-bold ${p.status === 'forwarding' ? 'bg-emerald-950 text-emerald-400 border border-emerald-800/40' : 'bg-slate-800 text-slate-400'} uppercase font-mono">${p.status}</span>
      </td>
      <td class="py-2.5 px-3 text-slate-400 italic truncate max-w-[120px]" title="${p.comment || ''}">${p.comment || '-'}</td>
      <td class="py-2.5 px-3 text-right space-x-1.5 font-sans whitespace-nowrap">
        <button onclick="toggleBridgePortState('${p.id}', ${!p.disabled})" class="text-xs ${p.disabled ? 'text-emerald-400' : 'text-slate-400'} hover:underline font-semibold">${p.disabled ? 'Enable' : 'Disable'}</button>
        <button onclick="openEditBridgePortModal('${p.id}')" class="text-xs text-slate-400 hover:text-white">Edit</button>
        <button onclick="deleteBridgePort('${p.id}')" class="text-xs text-slate-500 hover:text-rose-400">Delete</button>
      </td>
    `;
    tbody.appendChild(tr);
  });
}

function openAddBridgePortModal() {
  document.getElementById('bridge-port-modal-title').innerText = 'Add Port to Bridge';
  document.getElementById('bridge-port-modal-id').value = '';
  populateBridgeSelect('bridge-port-modal-bridge');
  populateBridgePortCandidateSelect('bridge-port-modal-interface');
  document.getElementById('bridge-port-modal-pvid').value = '1';
  document.getElementById('bridge-port-modal-frametypes').value = 'admit-all';
  document.getElementById('bridge-port-modal-ingressfiltering').checked = false;
  document.getElementById('bridge-port-modal-horizon').value = '0';
  document.getElementById('bridge-port-modal-pathcost').value = '10';
  document.getElementById('bridge-port-modal-priority').value = '128';
  document.getElementById('bridge-port-modal-learn').checked = true;
  document.getElementById('bridge-port-modal-comment').value = '';
  document.getElementById('bridge-port-modal-disabled').checked = false;
  document.getElementById('bridge-port-modal').classList.remove('hidden');
}

function openEditBridgePortModal(id) {
  const p = (state.bridgePorts || []).find(x => x.id === id);
  if (!p) return;

  document.getElementById('bridge-port-modal-title').innerText = `Edit Bridge Port (${p.interface})`;
  document.getElementById('bridge-port-modal-id').value = p.id;
  populateBridgeSelect('bridge-port-modal-bridge', p.bridge);
  populateBridgePortCandidateSelect('bridge-port-modal-interface', p.interface);
  document.getElementById('bridge-port-modal-pvid').value = p.pvid || 1;
  document.getElementById('bridge-port-modal-frametypes').value = p.frame_types || 'admit-all';
  document.getElementById('bridge-port-modal-ingressfiltering').checked = !!p.ingress_filtering;
  document.getElementById('bridge-port-modal-horizon').value = p.horizon || 0;
  document.getElementById('bridge-port-modal-pathcost').value = p.path_cost || 10;
  document.getElementById('bridge-port-modal-priority').value = p.priority || 128;
  document.getElementById('bridge-port-modal-learn').checked = p.learn !== false;
  document.getElementById('bridge-port-modal-comment').value = p.comment || '';
  document.getElementById('bridge-port-modal-disabled').checked = !!p.disabled;
  document.getElementById('bridge-port-modal').classList.remove('hidden');
}

function closeBridgePortModal() {
  document.getElementById('bridge-port-modal').classList.add('hidden');
}

async function submitSaveBridgePort(e) {
  e.preventDefault();
  const id = document.getElementById('bridge-port-modal-id').value;
  const bridge = document.getElementById('bridge-port-modal-bridge').value;
  const iface = document.getElementById('bridge-port-modal-interface').value;
  const pvid = parseInt(document.getElementById('bridge-port-modal-pvid').value, 10) || 1;
  const frameTypes = document.getElementById('bridge-port-modal-frametypes').value;
  const ingressFiltering = document.getElementById('bridge-port-modal-ingressfiltering').checked;
  const horizon = parseInt(document.getElementById('bridge-port-modal-horizon').value, 10) || 0;
  const pathCost = parseInt(document.getElementById('bridge-port-modal-pathcost').value, 10) || 10;
  const priority = parseInt(document.getElementById('bridge-port-modal-priority').value, 10) || 128;
  const learn = document.getElementById('bridge-port-modal-learn').checked;
  const comment = document.getElementById('bridge-port-modal-comment').value.trim();
  const disabled = document.getElementById('bridge-port-modal-disabled').checked;

  try {
    const res = await fetch(`${API_BASE}/bridge/ports`, {
      method: 'POST',
      headers: { 'Content-Type': 'application/json' },
      body: JSON.stringify({
        id,
        bridge,
        interface: iface,
        pvid,
        frame_types: frameTypes,
        ingress_filtering: ingressFiltering,
        horizon,
        path_cost: pathCost,
        priority,
        learn,
        comment,
        disabled
      })
    });
    if (res.ok) {
      showToast('Port Attached', `${iface} added to ${bridge}`, 'success');
      closeBridgePortModal();
      loadBridge();
      fetchData(false);
    } else {
      const err = await res.json();
      showToast('Error', err.error || err.message || 'Failed to save port', 'error');
    }
  } catch (err) {
    showToast('Error', err.message, 'error');
  }
}

async function toggleBridgePortState(id, disabled) {
  try {
    const res = await fetch(`${API_BASE}/bridge/ports/${encodeURIComponent(id)}/state`, {
      method: 'POST',
      headers: { 'Content-Type': 'application/json' },
      body: JSON.stringify({ disabled })
    });
    if (res.ok) {
      loadBridge();
      fetchData(false);
    }
  } catch (err) {
    showToast('Error', err.message, 'error');
  }
}

async function deleteBridgePort(id) {
  const p = (state.bridgePorts || []).find(x => x.id === id);
  const iface = p ? p.interface : id;
  if (!confirm(`Detach interface '${iface}' from bridge?`)) return;

  try {
    const res = await fetch(`${API_BASE}/bridge/ports/${encodeURIComponent(id)}`, { method: 'DELETE' });
    if (res.ok) {
      showToast('Port Detached', `${iface} removed from bridge`, 'success');
      loadBridge();
      fetchData(false);
    }
  } catch (err) {
    showToast('Error', err.message, 'error');
  }
}

// ----------------- Bridge VLANs -----------------

function renderBridgeVLANs() {
  const tbody = document.getElementById('bridge-vlans-table-body');
  const empty = document.getElementById('bridge-empty-vlans');
  const countBadge = document.getElementById('bridge-vlans-count-badge');
  const filterBridge = document.getElementById('bridge-vlans-filter-bridge')?.value || '';
  if (!tbody) return;
  tbody.innerHTML = '';

  populateBridgeSelect('bridge-vlans-filter-bridge', filterBridge, true);

  const vlans = (state.bridgeVLANs || []).filter(v => !filterBridge || v.bridge === filterBridge);
  if (countBadge) countBadge.innerText = `${vlans.length} Entries`;

  if (vlans.length === 0) {
    empty?.classList.remove('hidden');
    return;
  }
  empty?.classList.add('hidden');

  vlans.forEach((v, idx) => {
    const tr = document.createElement('tr');
    tr.className = `hover:bg-slate-800/40 transition text-xs ${v.disabled ? 'opacity-50' : ''}`;

    const taggedHtml = (v.tagged && v.tagged.length > 0)
      ? v.tagged.map(p => `<span class="px-1.5 py-0.5 rounded text-[10px] bg-cyan-950/80 border border-cyan-800/40 text-cyan-300 font-mono">${p}</span>`).join(' ')
      : '<span class="text-slate-600">none</span>';

    const untaggedHtml = (v.untagged && v.untagged.length > 0)
      ? v.untagged.map(p => `<span class="px-1.5 py-0.5 rounded text-[10px] bg-slate-800 border border-slate-700/60 text-slate-300 font-mono">${p}</span>`).join(' ')
      : '<span class="text-slate-600">none</span>';

    const disabledFlag = v.disabled ? '<span class="text-rose-400 font-bold" title="Disabled (X)">X</span>' : '<span class="text-slate-600">-</span>';

    tr.innerHTML = `
      <td class="py-2.5 px-3 text-center text-slate-500 font-bold">${idx + 1}</td>
      <td class="py-2.5 px-3 text-center font-mono">${disabledFlag}</td>
      <td class="py-2.5 px-3 font-semibold text-sky-400">${v.bridge}</td>
      <td class="py-2.5 px-3 font-bold text-white font-mono text-sm">${v.vlan_ids}</td>
      <td class="py-2.5 px-3"><div class="flex items-center gap-1.5 flex-wrap">${taggedHtml}</div></td>
      <td class="py-2.5 px-3"><div class="flex items-center gap-1.5 flex-wrap">${untaggedHtml}</div></td>
      <td class="py-2.5 px-3 text-slate-400 italic truncate max-w-[120px]" title="${v.comment || ''}">${v.comment || '-'}</td>
      <td class="py-2.5 px-3 text-right space-x-1.5 font-sans whitespace-nowrap">
        <button onclick="toggleBridgeVLANState('${v.id}', ${!v.disabled})" class="text-xs ${v.disabled ? 'text-emerald-400' : 'text-slate-400'} hover:underline font-semibold">${v.disabled ? 'Enable' : 'Disable'}</button>
        <button onclick="openEditBridgeVLANModal('${v.id}')" class="text-xs text-slate-400 hover:text-white">Edit</button>
        <button onclick="deleteBridgeVLAN('${v.id}')" class="text-xs text-slate-500 hover:text-rose-400">Delete</button>
      </td>
    `;
    tbody.appendChild(tr);
  });
}

function openAddBridgeVLANModal() {
  document.getElementById('bridge-vlan-modal-title').innerText = 'Add Bridge VLAN Entry';
  document.getElementById('bridge-vlan-modal-id').value = '';
  populateBridgeSelect('bridge-vlan-modal-bridge');
  document.getElementById('bridge-vlan-modal-vlanids').value = '';
  document.getElementById('bridge-vlan-modal-comment').value = '';
  document.getElementById('bridge-vlan-modal-disabled').checked = false;
  updateBridgeVlanPortCheckboxes();
  document.getElementById('bridge-vlan-modal').classList.remove('hidden');
}

function openEditBridgeVLANModal(id) {
  const v = (state.bridgeVLANs || []).find(x => x.id === id);
  if (!v) return;

  document.getElementById('bridge-vlan-modal-title').innerText = `Edit Bridge VLAN (${v.vlan_ids})`;
  document.getElementById('bridge-vlan-modal-id').value = v.id;
  populateBridgeSelect('bridge-vlan-modal-bridge', v.bridge);
  document.getElementById('bridge-vlan-modal-vlanids').value = v.vlan_ids;
  document.getElementById('bridge-vlan-modal-comment').value = v.comment || '';
  document.getElementById('bridge-vlan-modal-disabled').checked = !!v.disabled;
  updateBridgeVlanPortCheckboxes(v.tagged || [], v.untagged || []);
  document.getElementById('bridge-vlan-modal').classList.remove('hidden');
}

function closeBridgeVlanModal() {
  document.getElementById('bridge-vlan-modal').classList.add('hidden');
}

function updateBridgeVlanPortCheckboxes(taggedSelected = [], untaggedSelected = []) {
  const selBridge = document.getElementById('bridge-vlan-modal-bridge')?.value || '';
  const taggedBox = document.getElementById('bridge-vlan-tagged-ports');
  const untaggedBox = document.getElementById('bridge-vlan-untagged-ports');
  if (!taggedBox || !untaggedBox) return;

  // Ports belonging to the selected bridge
  const memberPorts = (state.bridgePorts || []).filter(p => !selBridge || p.bridge === selBridge);

  if (memberPorts.length === 0) {
    taggedBox.innerHTML = '<span class="text-slate-500 text-xs font-sans">No member ports found in this bridge</span>';
    untaggedBox.innerHTML = '<span class="text-slate-500 text-xs font-sans">No member ports found in this bridge</span>';
    return;
  }

  taggedBox.innerHTML = memberPorts.map(p => `
    <label class="flex items-center space-x-2 text-xs cursor-pointer hover:bg-slate-900/60 p-1 rounded">
      <input type="checkbox" name="bvlan-tagged" value="${p.interface}" ${taggedSelected.includes(p.interface) ? 'checked' : ''} class="rounded bg-slate-800 border-slate-700 text-cyan-500">
      <span>${p.interface}</span>
    </label>
  `).join('');

  untaggedBox.innerHTML = memberPorts.map(p => `
    <label class="flex items-center space-x-2 text-xs cursor-pointer hover:bg-slate-900/60 p-1 rounded">
      <input type="checkbox" name="bvlan-untagged" value="${p.interface}" ${untaggedSelected.includes(p.interface) ? 'checked' : ''} class="rounded bg-slate-800 border-slate-700 text-slate-400">
      <span>${p.interface}</span>
    </label>
  `).join('');
}

async function submitSaveBridgeVLAN(e) {
  e.preventDefault();
  const id = document.getElementById('bridge-vlan-modal-id').value;
  const bridge = document.getElementById('bridge-vlan-modal-bridge').value;
  const vlanIDs = document.getElementById('bridge-vlan-modal-vlanids').value.trim();
  const comment = document.getElementById('bridge-vlan-modal-comment').value.trim();
  const disabled = document.getElementById('bridge-vlan-modal-disabled').checked;

  const tagged = Array.from(document.querySelectorAll('input[name="bvlan-tagged"]:checked')).map(x => x.value);
  const untagged = Array.from(document.querySelectorAll('input[name="bvlan-untagged"]:checked')).map(x => x.value);

  try {
    const res = await fetch(`${API_BASE}/bridge/vlans`, {
      method: 'POST',
      headers: { 'Content-Type': 'application/json' },
      body: JSON.stringify({
        id,
        bridge,
        vlan_ids: vlanIDs,
        tagged,
        untagged,
        comment,
        disabled
      })
    });
    if (res.ok) {
      showToast('VLAN Entry Saved', `VLAN ${vlanIDs} configured on ${bridge}`, 'success');
      closeBridgeVlanModal();
      loadBridge();
    } else {
      const err = await res.json();
      showToast('Error', err.error || err.message || 'Failed to save VLAN entry', 'error');
    }
  } catch (err) {
    showToast('Error', err.message, 'error');
  }
}

async function toggleBridgeVLANState(id, disabled) {
  try {
    const res = await fetch(`${API_BASE}/bridge/vlans/${encodeURIComponent(id)}/state`, {
      method: 'POST',
      headers: { 'Content-Type': 'application/json' },
      body: JSON.stringify({ disabled })
    });
    if (res.ok) loadBridge();
  } catch (err) {
    showToast('Error', err.message, 'error');
  }
}

async function deleteBridgeVLAN(id) {
  if (!confirm('Delete this bridge VLAN entry?')) return;
  try {
    const res = await fetch(`${API_BASE}/bridge/vlans/${encodeURIComponent(id)}`, { method: 'DELETE' });
    if (res.ok) {
      showToast('Deleted', 'VLAN entry removed from bridge', 'success');
      loadBridge();
    }
  } catch (err) {
    showToast('Error', err.message, 'error');
  }
}

// ----------------- Hosts / MAC Table -----------------

async function loadBridgeHosts() {
  const filterBridge = document.getElementById('bridge-hosts-filter-bridge')?.value || '';
  populateBridgeSelect('bridge-hosts-filter-bridge', filterBridge, true);

  try {
    const url = filterBridge ? `${API_BASE}/bridge/hosts?bridge=${encodeURIComponent(filterBridge)}` : `${API_BASE}/bridge/hosts`;
    const res = await fetch(url);
    if (res.ok) {
      state.bridgeHosts = await res.json();
      renderBridgeHosts();
    }
  } catch (err) {
    console.error('Failed to load bridge hosts:', err);
  }
}

function renderBridgeHosts() {
  const tbody = document.getElementById('bridge-hosts-table-body');
  const empty = document.getElementById('bridge-empty-hosts');
  const countBadge = document.getElementById('bridge-hosts-count-badge');
  const search = (document.getElementById('bridge-hosts-search')?.value || '').toLowerCase().trim();
  if (!tbody) return;
  tbody.innerHTML = '';

  const hosts = (state.bridgeHosts || []).filter(h => {
    if (!search) return true;
    return (h.mac || '').toLowerCase().includes(search) || (h.interface || '').toLowerCase().includes(search) || (h.bridge || '').toLowerCase().includes(search);
  });

  if (countBadge) countBadge.innerText = `${hosts.length} Hosts`;

  if (hosts.length === 0) {
    empty?.classList.remove('hidden');
    return;
  }
  empty?.classList.add('hidden');

  hosts.forEach(h => {
    const tr = document.createElement('tr');
    tr.className = 'hover:bg-slate-800/40 transition text-xs';

    let flagBadges = '';
    if (h.local) flagBadges += '<span class="px-1.5 py-0.2 rounded text-[10px] bg-sky-950 text-sky-400 border border-sky-800/40 font-mono font-bold mr-1" title="Local router interface MAC">L</span>';
    if (h.static) flagBadges += '<span class="px-1.5 py-0.2 rounded text-[10px] bg-purple-950 text-purple-400 border border-purple-800/40 font-mono font-bold mr-1" title="Static entry">S</span>';
    if (!h.local && !h.static) flagBadges += '<span class="px-1.5 py-0.2 rounded text-[10px] bg-emerald-950 text-emerald-400 border border-emerald-800/40 font-mono font-bold mr-1" title="Dynamically learned">D</span>';

    tr.innerHTML = `
      <td class="py-2.5 px-3 font-mono font-bold text-white text-sm">${h.mac}</td>
      <td class="py-2.5 px-3 font-semibold text-emerald-400 font-mono">${h.interface || '-'}</td>
      <td class="py-2.5 px-3 font-mono text-sky-400">${h.bridge || '-'}</td>
      <td class="py-2.5 px-3 font-mono">${h.vlan_id || 1}</td>
      <td class="py-2.5 px-3 font-mono text-slate-400">${h.age ? h.age.toFixed(1) + 's' : '-'}</td>
      <td class="py-2.5 px-3">${flagBadges}</td>
    `;
    tbody.appendChild(tr);
  });
}

async function flushBridgeHosts() {
  const selBridge = document.getElementById('bridge-hosts-filter-bridge')?.value || (state.bridges[0] ? state.bridges[0].name : '');
  if (!selBridge) {
    showToast('Notice', 'Please select a bridge to flush dynamic MACs', 'info');
    return;
  }
  if (!confirm(`Flush all dynamic learned MAC addresses on bridge '${selBridge}'?`)) return;

  try {
    const res = await fetch(`${API_BASE}/bridge/hosts/flush`, {
      method: 'POST',
      headers: { 'Content-Type': 'application/json' },
      body: JSON.stringify({ bridge: selBridge })
    });
    if (res.ok) {
      showToast('FDB Flushed', `Dynamic MACs flushed on ${selBridge}`, 'success');
      loadBridgeHosts();
    }
  } catch (err) {
    showToast('Error', err.message, 'error');
  }
}

// ----------------- Helpers -----------------

function populateBridgeSelect(selectId, currentVal = '', includeAll = false) {
  const sel = document.getElementById(selectId);
  if (!sel) return;
  const prevVal = currentVal || sel.value;
  sel.innerHTML = includeAll ? '<option value="">All Bridges</option>' : '';

  (state.bridges || []).forEach(b => {
    const opt = document.createElement('option');
    opt.value = b.name;
    opt.innerText = `${b.name} (${b.ports_count} ports)`;
    if (b.name === prevVal) opt.selected = true;
    sel.appendChild(opt);
  });
}

function populateBridgePortCandidateSelect(selectId, currentVal = '') {
  const sel = document.getElementById(selectId);
  if (!sel) return;
  sel.innerHTML = '<option value="">(Select Interface...)</option>';

  // 1. Physical Interfaces
  const grpPhys = document.createElement('optgroup');
  grpPhys.label = 'Physical Interfaces';
  (state.interfaces || []).filter(i => i.type !== 'bridge' && i.type !== 'vlan' && i.type !== 'loopback').forEach(i => {
    const opt = document.createElement('option');
    opt.value = i.name;
    opt.innerText = `${i.name} (${i.role || i.type})`;
    if (i.name === currentVal) opt.selected = true;
    grpPhys.appendChild(opt);
  });
  if (grpPhys.children.length > 0) sel.appendChild(grpPhys);

  // 2. VLAN Sub-interfaces
  const grpVlans = document.createElement('optgroup');
  grpVlans.label = 'VLAN Sub-interfaces (802.1Q)';
  (state.vlans || []).forEach(v => {
    const opt = document.createElement('option');
    opt.value = v.name;
    opt.innerText = `${v.name} (VLAN ${v.vlan_id})`;
    if (v.name === currentVal) opt.selected = true;
    grpVlans.appendChild(opt);
  });
  if (grpVlans.children.length > 0) sel.appendChild(grpVlans);

  // 3. EoIP Tunnels (MikroTik EoIP bridging!)
  const grpEoip = document.createElement('optgroup');
  grpEoip.label = 'EoIP Tunnels (Layer 2 VPN)';
  (state.eoipTunnels || []).forEach(t => {
    const opt = document.createElement('option');
    opt.value = t.name;
    opt.innerText = `${t.name} (Tunnel ID: ${t.tunnel_id} -> ${t.remote_address})`;
    if (t.name === currentVal) opt.selected = true;
    grpEoip.appendChild(opt);
  });
  if (grpEoip.children.length > 0) sel.appendChild(grpEoip);

  // 4. VXLAN Tunnels (MikroTik VXLAN bridging!)
  const grpVxlan = document.createElement('optgroup');
  grpVxlan.label = 'VXLAN Tunnels (Layer 2 Overlay)';
  (state.vxlanTunnels || []).forEach(t => {
    const opt = document.createElement('option');
    opt.value = t.name;
    opt.innerText = `${t.name} (VNI: ${t.vni}, Port: ${t.port})`;
    if (t.name === currentVal) opt.selected = true;
    grpVxlan.appendChild(opt);
  });
  if (grpVxlan.children.length > 0) sel.appendChild(grpVxlan);
}

// -------------------------------------------------------------
// DebTik Routing Filters Management (/routing filter)
// -------------------------------------------------------------

if (!state.activeRoutingFilterTab) state.activeRoutingFilterTab = 'rules';
if (!state.selectedFilterRow) state.selectedFilterRow = {};
if (!state.rfSort) state.rfSort = {};

function switchRoutingFilterTab(tab) {
  state.activeRoutingFilterTab = tab;
  const tabs = ['rules', 'community-lists', 'as-lists'];

  tabs.forEach(t => {
    const btn = document.getElementById(`tab-rf-${t}`);
    const content = document.getElementById(`tab-content-rf-${t}`);
    if (btn) {
      if (t === tab) {
        btn.className = 'px-3 py-1 text-xs font-semibold rounded bg-emerald-600/20 text-emerald-300 border border-emerald-500/30 transition shadow-sm';
      } else {
        btn.className = 'px-3 py-1 text-xs font-semibold rounded text-slate-400 hover:text-white hover:bg-slate-800 transition';
      }
    }
    if (content) {
      if (t === tab) content.classList.remove('hidden');
      else content.classList.add('hidden');
    }
  });

  const chainContainer = document.getElementById('rf-chain-filter-container');
  if (chainContainer) {
    if (tab === 'rules') chainContainer.classList.remove('hidden');
    else chainContainer.classList.add('hidden');
  }

  renderRoutingFilters();
}

function selectFilterRow(tab, id) {
  if (state.selectedFilterRow[tab] === id) {
    delete state.selectedFilterRow[tab];
  } else {
    state.selectedFilterRow[tab] = id;
  }
  if (tab === 'rules') renderRoutingFilterRules();
  else if (tab === 'community-lists') renderRoutingFilterCommunityLists();
  else if (tab === 'as-lists') renderRoutingFilterASLists();
}

function openRoutingFilterNewModal() {
  const tab = state.activeRoutingFilterTab || 'rules';
  if (tab === 'rules') openAddRoutingFilterModal();
  else if (tab === 'community-lists') openAddCommunityListModal();
  else if (tab === 'as-lists') openAddASListModal();
}

function toggleSelectedRoutingFilter(disabled) {
  const tab = state.activeRoutingFilterTab || 'rules';
  const id = state.selectedFilterRow[tab];
  if (!id) {
    showToast('Select Row', 'Please click on a row to select it first', 'info');
    return;
  }
  if (tab === 'rules') toggleRoutingFilterState(id, disabled);
  else if (tab === 'community-lists') toggleCommunityListState(id, disabled);
  else if (tab === 'as-lists') toggleASListState(id, disabled);
}

function removeSelectedRoutingFilter() {
  const tab = state.activeRoutingFilterTab || 'rules';
  const id = state.selectedFilterRow[tab];
  if (!id) {
    showToast('Select Row', 'Please click on a row to select it first', 'info');
    return;
  }
  if (tab === 'rules') deleteRoutingFilter(id);
  else if (tab === 'community-lists') deleteCommunityList(id);
  else if (tab === 'as-lists') deleteASList(id);
}

function searchRoutingFilters(q) {
  state.rfSearchQuery = (q || '').trim().toLowerCase();
  renderRoutingFilters();
}

function sortFilterTable(tab, col) {
  if (!state.rfSort) state.rfSort = {};
  if (!state.rfSort[tab]) state.rfSort[tab] = { col: col, asc: true };
  if (state.rfSort[tab].col === col) {
    state.rfSort[tab].asc = !state.rfSort[tab].asc;
  } else {
    state.rfSort[tab].col = col;
    state.rfSort[tab].asc = true;
  }
  const asc = state.rfSort[tab].asc;

  let list = [];
  if (tab === 'rules') list = state.routingFilters || [];
  else if (tab === 'community-lists') list = state.routingCommunityLists || [];
  else if (tab === 'as-lists') list = state.routingASLists || [];

  list.sort((a, b) => {
    let valA = a[col] ?? '';
    let valB = b[col] ?? '';
    if (col === 'flags') {
      valA = a.disabled ? 'X' : 'A';
      valB = b.disabled ? 'X' : 'A';
    }
    if (typeof valA === 'number' && typeof valB === 'number') {
      return asc ? valA - valB : valB - valA;
    }
    return asc ? String(valA).localeCompare(String(valB)) : String(valB).localeCompare(String(valA));
  });

  const allCols = ['flags', 'rule_order', 'chain', 'rule', 'name', 'communities', 'range', 'regexp', 'comment'];
  allCols.forEach(c => {
    const el = document.getElementById(`sort-icon-${tab}-${c}`);
    if (el) el.innerText = (c === col) ? (asc ? '▲' : '▼') : '';
  });

  if (tab === 'rules') renderRoutingFilterRules();
  else if (tab === 'community-lists') renderRoutingFilterCommunityLists();
  else if (tab === 'as-lists') renderRoutingFilterASLists();
}

function renderRoutingFilters() {
  const navBadge = document.getElementById('badge-filters-count');
  const allRules = state.routingFilters || [];
  if (navBadge) navBadge.innerText = allRules.length;

  // Populate chain filter select options and datalist
  const chainSelect = document.getElementById('routing-filter-chain-select');
  const chainDatalist = document.getElementById('dl-routing-chains');
  const uniqueChains = Array.from(new Set(allRules.map(r => r.chain).filter(Boolean))).sort();

  if (chainSelect) {
    const currentVal = state.filterChainSelected || 'all';
    chainSelect.innerHTML = `<option value="all">All Chains (${allRules.length})</option>` +
      uniqueChains.map(ch => {
        const count = allRules.filter(r => r.chain === ch).length;
        return `<option value="${escapeHtml(ch)}"${currentVal === ch ? ' selected' : ''}>${escapeHtml(ch)} (${count})</option>`;
      }).join('');
    chainSelect.value = currentVal;
  }

  if (chainDatalist) {
    chainDatalist.innerHTML = uniqueChains.map(ch => `<option value="${escapeHtml(ch)}">`).join('');
  }

  renderRoutingFilterRules();
  renderRoutingFilterCommunityLists();
  renderRoutingFilterASLists();
}

function filterRoutingFiltersByChain(chain) {
  state.filterChainSelected = chain;
  renderRoutingFilters();
}

// -------------------------------------------------------------
// TAB 1: RULES (/routing filter rule)
// -------------------------------------------------------------

function renderRoutingFilterRules() {
  const tbody = document.getElementById('routing-filter-rules-tbody');
  if (!tbody) return;
  const empty = document.getElementById('rf-rules-empty');
  const statusCount = document.getElementById('rf-status-count');

  let list = (state.routingFilters || []).slice();

  if (state.filterChainSelected && state.filterChainSelected !== 'all') {
    list = list.filter(r => r.chain === state.filterChainSelected);
  }

  const q = state.rfSearchQuery;
  if (q) {
    list = list.filter(r =>
      (r.chain && r.chain.toLowerCase().includes(q)) ||
      (r.rule && r.rule.toLowerCase().includes(q)) ||
      (r.prefix && r.prefix.toLowerCase().includes(q)) ||
      (r.comment && r.comment.toLowerCase().includes(q))
    );
  }

  if (!state.rfSort?.['rules']) {
    list.sort((a, b) => {
      if (a.chain !== b.chain) return (a.chain || '').localeCompare(b.chain || '');
      return (a.rule_order || 0) - (b.rule_order || 0);
    });
  }

  if (statusCount && (state.activeRoutingFilterTab === 'rules' || !state.activeRoutingFilterTab)) {
    statusCount.innerText = `${list.length} item${list.length === 1 ? '' : 's'}`;
  }

  if (list.length === 0) {
    tbody.innerHTML = '';
    if (empty) empty.classList.remove('hidden');
    return;
  }
  if (empty) empty.classList.add('hidden');

  tbody.innerHTML = list.map(r => {
    const isSelected = state.selectedFilterRow?.['rules'] === r.id;
    const flagA = !r.disabled ? '<span class="text-cyan-400 font-bold" title="Active">A</span>' : '';
    const flagX = r.disabled ? '<span class="text-rose-400 font-bold" title="Disabled">X</span>' : '';
    const flagC = r.comment ? '<span class="text-amber-400 font-bold ml-1" title="Comment">C</span>' : '';

    let ruleDisplay = '';
    if (r.rule && r.rule.trim() !== '') {
      ruleDisplay = `<span class="text-emerald-400 font-mono font-medium">${escapeHtml(r.rule)}</span>`;
    } else {
      let conds = [];
      if (r.prefix) conds.push(`dst in ${escapeHtml(r.prefix)}`);
      if (r.match_protocol && r.match_protocol !== 'any') conds.push(`protocol ${escapeHtml(r.match_protocol)}`);
      let act = r.action || 'accept';
      ruleDisplay = `<span class="text-slate-300 font-mono">if (${conds.length ? conds.join(' && ') : 'true'}) { ${escapeHtml(act)}; }</span>`;
    }

    return `
      <tr onclick="selectFilterRow('rules', '${r.id}')" class="cursor-pointer transition select-none ${isSelected ? 'bg-emerald-950/40 ring-1 ring-emerald-500/40' : 'hover:bg-slate-800/40'}">
        <td class="py-2 px-2 text-center tracking-wider">${flagA}${flagX}${flagC}</td>
        <td class="py-2 px-2 font-mono text-slate-400 font-bold">${r.rule_order || 10}</td>
        <td class="py-2 px-3">
          <span class="px-2 py-0.5 rounded text-[11px] font-mono bg-slate-800 text-cyan-300 border border-slate-700 font-semibold">${escapeHtml(r.chain)}</span>
        </td>
        <td class="py-2 px-3 break-all max-w-xl">${ruleDisplay}</td>
        <td class="py-2 px-3 text-slate-400 font-sans truncate max-w-xs">${escapeHtml(r.comment || '')}</td>
        <td class="py-2 px-3 text-right space-x-1 whitespace-nowrap font-sans" onclick="event.stopPropagation()">
          <button onclick="moveRoutingFilterOrder('${r.id}', -1)" title="Move Up" class="px-1.5 py-0.5 rounded text-[10px] bg-slate-800 hover:bg-slate-700 text-slate-300 border border-slate-700">▲</button>
          <button onclick="moveRoutingFilterOrder('${r.id}', 1)" title="Move Down" class="px-1.5 py-0.5 rounded text-[10px] bg-slate-800 hover:bg-slate-700 text-slate-300 border border-slate-700">▼</button>
          <button onclick="toggleRoutingFilterState('${r.id}', ${!r.disabled})" class="px-2 py-0.5 rounded text-[10px] ${r.disabled ? 'bg-emerald-950 hover:bg-emerald-900 text-emerald-400 border border-emerald-800/50' : 'bg-slate-800 hover:bg-slate-700 text-slate-300 border border-slate-700'}">
            ${r.disabled ? 'Enable' : 'Disable'}
          </button>
          <button onclick="openEditRoutingFilterModal('${r.id}')" class="px-2 py-0.5 rounded text-[10px] bg-slate-800 hover:bg-slate-700 text-emerald-300 border border-slate-700">
            Edit
          </button>
          <button onclick="deleteRoutingFilter('${r.id}')" class="px-2 py-0.5 rounded text-[10px] bg-rose-950/60 hover:bg-rose-900 text-rose-300 border border-rose-900/50">
            ✕
          </button>
        </td>
      </tr>
    `;
  }).join('');
}

// -------------------------------------------------------------
// TAB 2: COMMUNITY LISTS (/routing filter community-list)
// -------------------------------------------------------------

function renderRoutingFilterCommunityLists() {
  const tbody = document.getElementById('routing-filter-comm-lists-tbody');
  if (!tbody) return;
  const empty = document.getElementById('rf-comm-lists-empty');
  const statusCount = document.getElementById('rf-status-count');

  let list = (state.routingCommunityLists || []).slice();

  const q = state.rfSearchQuery;
  if (q) {
    list = list.filter(cl =>
      (cl.name && cl.name.toLowerCase().includes(q)) ||
      (cl.comment && cl.comment.toLowerCase().includes(q)) ||
      (cl.communities && cl.communities.some(c => c.toLowerCase().includes(q)))
    );
  }

  if (statusCount && state.activeRoutingFilterTab === 'community-lists') {
    statusCount.innerText = `${list.length} item${list.length === 1 ? '' : 's'}`;
  }

  if (list.length === 0) {
    tbody.innerHTML = '';
    if (empty) empty.classList.remove('hidden');
    return;
  }
  if (empty) empty.classList.add('hidden');

  tbody.innerHTML = list.map(cl => {
    const isSelected = state.selectedFilterRow?.['community-lists'] === cl.id;
    const flagA = !cl.disabled ? '<span class="text-cyan-400 font-bold">A</span>' : '';
    const flagX = cl.disabled ? '<span class="text-rose-400 font-bold">X</span>' : '';

    const commBadges = (cl.communities || []).map(c =>
      `<span class="px-1.5 py-0.5 rounded text-[10px] bg-indigo-950 text-indigo-300 border border-indigo-800/40 font-mono">${escapeHtml(c)}</span>`
    ).join(' ');

    return `
      <tr onclick="selectFilterRow('community-lists', '${cl.id}')" class="cursor-pointer transition select-none ${isSelected ? 'bg-emerald-950/40 ring-1 ring-emerald-500/40' : 'hover:bg-slate-800/40'}">
        <td class="py-2 px-2 text-center tracking-wider">${flagA}${flagX}</td>
        <td class="py-2 px-3 font-mono font-bold text-white">${escapeHtml(cl.name)}</td>
        <td class="py-2 px-3 space-x-1">${commBadges || '<span class="text-slate-600">-</span>'}</td>
        <td class="py-2 px-3 font-mono text-slate-400">${escapeHtml(cl.regexp || '-')}</td>
        <td class="py-2 px-3 text-slate-400 font-sans truncate max-w-xs">${escapeHtml(cl.comment || '')}</td>
        <td class="py-2 px-3 text-right space-x-1 whitespace-nowrap font-sans" onclick="event.stopPropagation()">
          <button onclick="toggleCommunityListState('${cl.id}', ${!cl.disabled})" class="px-2 py-0.5 rounded text-[10px] ${cl.disabled ? 'bg-emerald-950 hover:bg-emerald-900 text-emerald-400 border border-emerald-800/50' : 'bg-slate-800 hover:bg-slate-700 text-slate-300 border border-slate-700'}">
            ${cl.disabled ? 'Enable' : 'Disable'}
          </button>
          <button onclick="openEditCommunityListModal('${cl.id}')" class="px-2 py-0.5 rounded text-[10px] bg-slate-800 hover:bg-slate-700 text-emerald-300 border border-slate-700">
            Edit
          </button>
          <button onclick="deleteCommunityList('${cl.id}')" class="px-2 py-0.5 rounded text-[10px] bg-rose-950/60 hover:bg-rose-900 text-rose-300 border border-rose-900/50">
            ✕
          </button>
        </td>
      </tr>
    `;
  }).join('');
}

// -------------------------------------------------------------
// TAB 4: AS LISTS (/routing filter num-list)
// -------------------------------------------------------------

function renderRoutingFilterASLists() {
  const tbody = document.getElementById('routing-filter-as-lists-tbody');
  if (!tbody) return;
  const empty = document.getElementById('rf-as-lists-empty');
  const statusCount = document.getElementById('rf-status-count');

  let list = (state.routingASLists || []).slice();

  const q = state.rfSearchQuery;
  if (q) {
    list = list.filter(al =>
      (al.name && al.name.toLowerCase().includes(q)) ||
      (al.range && al.range.toLowerCase().includes(q)) ||
      (al.comment && al.comment.toLowerCase().includes(q))
    );
  }

  if (statusCount && state.activeRoutingFilterTab === 'as-lists') {
    statusCount.innerText = `${list.length} item${list.length === 1 ? '' : 's'}`;
  }

  if (list.length === 0) {
    tbody.innerHTML = '';
    if (empty) empty.classList.remove('hidden');
    return;
  }
  if (empty) empty.classList.add('hidden');

  tbody.innerHTML = list.map(al => {
    const isSelected = state.selectedFilterRow?.['as-lists'] === al.id;
    const flagA = !al.disabled ? '<span class="text-cyan-400 font-bold">A</span>' : '';
    const flagX = al.disabled ? '<span class="text-rose-400 font-bold">X</span>' : '';

    return `
      <tr onclick="selectFilterRow('as-lists', '${al.id}')" class="cursor-pointer transition select-none ${isSelected ? 'bg-emerald-950/40 ring-1 ring-emerald-500/40' : 'hover:bg-slate-800/40'}">
        <td class="py-2 px-2 text-center tracking-wider">${flagA}${flagX}</td>
        <td class="py-2 px-3 font-mono font-bold text-white">${escapeHtml(al.name)}</td>
        <td class="py-2 px-3 font-mono text-purple-300">${escapeHtml(al.range)}</td>
        <td class="py-2 px-3 text-slate-400 font-sans truncate max-w-xs">${escapeHtml(al.comment || '')}</td>
        <td class="py-2 px-3 text-right space-x-1 whitespace-nowrap font-sans" onclick="event.stopPropagation()">
          <button onclick="toggleASListState('${al.id}', ${!al.disabled})" class="px-2 py-0.5 rounded text-[10px] ${al.disabled ? 'bg-emerald-950 hover:bg-emerald-900 text-emerald-400 border border-emerald-800/50' : 'bg-slate-800 hover:bg-slate-700 text-slate-300 border border-slate-700'}">
            ${al.disabled ? 'Enable' : 'Disable'}
          </button>
          <button onclick="openEditASListModal('${al.id}')" class="px-2 py-0.5 rounded text-[10px] bg-slate-800 hover:bg-slate-700 text-emerald-300 border border-slate-700">
            Edit
          </button>
          <button onclick="deleteASList('${al.id}')" class="px-2 py-0.5 rounded text-[10px] bg-rose-950/60 hover:bg-rose-900 text-rose-300 border border-rose-900/50">
            ✕
          </button>
        </td>
      </tr>
    `;
  }).join('');
}

// -------------------------------------------------------------
// SNIPPETS & WIZARD HELPERS
// -------------------------------------------------------------

function insertRuleSnippet(type) {
  const textarea = document.getElementById('modal-rf-rule');
  if (!textarea) return;
  let snippet = '';
  switch (type) {
    case 'accept-default':
      snippet = 'if (dst in 0.0.0.0/0) { accept; }';
      break;
    case 'drop-rfc1918':
      snippet = 'if (dst in 10.0.0.0/8 || dst in 172.16.0.0/12 || dst in 192.168.0.0/16) { reject; }';
      break;
    case 'len-24':
      snippet = 'if (dst-len > 24) { reject; }';
      break;
    case 'local-pref-150':
      snippet = 'if (dst in 10.0.0.0/8) { set bgp-local-pref 150; accept; }';
      break;
    case 'as-prepend-2':
      snippet = 'set bgp-path-prepend 2; accept;';
      break;
    case 'set-comm':
      snippet = 'set bgp-communities.add 65000:100; accept;';
      break;
    case 'match-comm':
      snippet = 'if (bgp-communities includes 65000:100) { accept; }';
      break;
    case 'reject-all':
      snippet = 'reject;';
      break;
  }
  if (!snippet) return;
  if (!textarea.value.trim()) {
    textarea.value = snippet;
  } else {
    textarea.value = textarea.value.trim() + '\n' + snippet;
  }
}

function generateScriptFromWizard() {
  const pfx = (document.getElementById('modal-rf-prefix')?.value || '').trim();
  const pfxLen = (document.getElementById('modal-rf-prefix-len')?.value || '').trim();
  const proto = document.getElementById('modal-rf-protocol')?.value || 'any';
  const asp = (document.getElementById('modal-rf-as-path')?.value || '').trim();
  const comm = (document.getElementById('modal-rf-community')?.value || '').trim();
  const act = document.getElementById('modal-rf-action')?.value || 'accept';
  const lp = parseInt(document.getElementById('modal-rf-set-local-pref')?.value, 10) || 0;
  const prep = parseInt(document.getElementById('modal-rf-set-as-prepend')?.value, 10) || 0;

  const conds = [];
  if (pfx) {
    if (pfxLen) {
      if (pfxLen.includes('-')) {
        const parts = pfxLen.split('-');
        conds.push(`dst in ${pfx}{${parts[0].trim()},${parts[1].trim()}}`);
      } else {
        conds.push(`dst in ${pfx} && dst-len >= ${pfxLen}`);
      }
    } else {
      conds.push(`dst in ${pfx}`);
    }
  }
  if (proto && proto !== 'any') {
    conds.push(`protocol ${proto}`);
  }
  if (asp) {
    conds.push(`bgp-as-path "${asp}"`);
  }
  if (comm) {
    conds.push(`bgp-communities includes ${comm}`);
  }

  const actions = [];
  if (lp > 0) actions.push(`set bgp-local-pref ${lp};`);
  if (prep > 0) actions.push(`set bgp-path-prepend ${prep};`);
  if (act && act !== 'passthrough') {
    actions.push(`${act};`);
  }

  let code = '';
  if (conds.length > 0) {
    code = `if (${conds.join(' && ')}) {\n    ${actions.join(' ')}\n}`;
  } else {
    code = actions.join(' ');
  }

  const textarea = document.getElementById('modal-rf-rule');
  if (textarea) textarea.value = code;
}

// -------------------------------------------------------------
// MODAL CRUD: RULES (/routing filter rule)
// -------------------------------------------------------------

function openAddRoutingFilterModal(defaultChain = '') {
  const form = document.getElementById('routing-filter-form');
  if (form) form.reset();
  const idEl = document.getElementById('modal-rf-id');
  if (idEl) idEl.value = '';
  const titleEl = document.getElementById('modal-rf-title');
  if (titleEl) titleEl.innerText = 'Add Routing Filter Rule';
  const chainEl = document.getElementById('modal-rf-chain');
  if (chainEl) chainEl.value = defaultChain || (state.filterChainSelected && state.filterChainSelected !== 'all' ? state.filterChainSelected : 'bgp-in');
  const orderEl = document.getElementById('modal-rf-order');
  if (orderEl) orderEl.value = ((state.routingFilters || []).length + 1) * 10;
  const ruleEl = document.getElementById('modal-rf-rule');
  if (ruleEl) ruleEl.value = 'if (dst in 10.0.0.0/8) { set bgp-local-pref 150; accept; }';
  const disEl = document.getElementById('modal-rf-disabled');
  if (disEl) disEl.checked = false;
  const modal = document.getElementById('modal-routing-filter');
  if (modal) modal.classList.remove('hidden');
}

function openEditRoutingFilterModal(id) {
  const r = (state.routingFilters || []).find(item => item.id === id);
  if (!r) return;
  const idEl = document.getElementById('modal-rf-id');
  if (idEl) idEl.value = r.id;
  const titleEl = document.getElementById('modal-rf-title');
  if (titleEl) titleEl.innerText = 'Edit Routing Filter Rule';
  const chainEl = document.getElementById('modal-rf-chain');
  if (chainEl) chainEl.value = r.chain || '';
  const orderEl = document.getElementById('modal-rf-order');
  if (orderEl) orderEl.value = r.rule_order || 10;
  const ruleEl = document.getElementById('modal-rf-rule');
  if (ruleEl) {
    if (r.rule) {
      ruleEl.value = r.rule;
    } else {
      let conds = [];
      if (r.prefix) conds.push(`dst in ${r.prefix}`);
      if (r.match_protocol && r.match_protocol !== 'any') conds.push(`protocol ${r.match_protocol}`);
      let act = r.action || 'accept';
      ruleEl.value = `if (${conds.length ? conds.join(' && ') : 'true'}) { ${act}; }`;
    }
  }
  const comEl = document.getElementById('modal-rf-comment');
  if (comEl) comEl.value = r.comment || '';
  const disEl = document.getElementById('modal-rf-disabled');
  if (disEl) disEl.checked = !!r.disabled;
  const modal = document.getElementById('modal-routing-filter');
  if (modal) modal.classList.remove('hidden');
}

function closeRoutingFilterModal() {
  const modal = document.getElementById('modal-routing-filter');
  if (modal) modal.classList.add('hidden');
}

async function submitRoutingFilter(e) {
  if (e) e.preventDefault();
  const payload = {
    id: document.getElementById('modal-rf-id').value,
    chain: document.getElementById('modal-rf-chain').value.trim(),
    rule_order: parseInt(document.getElementById('modal-rf-order').value, 10) || 10,
    rule: document.getElementById('modal-rf-rule').value.trim(),
    comment: document.getElementById('modal-rf-comment').value.trim(),
    disabled: document.getElementById('modal-rf-disabled').checked
  };

  try {
    const res = await fetch(`${API_BASE}/routing/filters`, {
      method: 'POST',
      headers: { 'Content-Type': 'application/json' },
      body: JSON.stringify(payload)
    });
    if (res.ok) {
      closeRoutingFilterModal();
      showToast('Success', 'Routing filter rule saved', 'success');
      loadDynamicRouting();
    } else {
      const err = await res.json();
      showToast('Error', err.error || 'Failed to save filter rule', 'error');
    }
  } catch (err) {
    showToast('Error', err.message, 'error');
  }
}

async function applyRoutingFilterForm() {
  const payload = {
    id: document.getElementById('modal-rf-id').value,
    chain: document.getElementById('modal-rf-chain').value.trim(),
    rule_order: parseInt(document.getElementById('modal-rf-order').value, 10) || 10,
    rule: document.getElementById('modal-rf-rule').value.trim(),
    comment: document.getElementById('modal-rf-comment').value.trim(),
    disabled: document.getElementById('modal-rf-disabled').checked
  };

  try {
    const res = await fetch(`${API_BASE}/routing/filters`, {
      method: 'POST',
      headers: { 'Content-Type': 'application/json' },
      body: JSON.stringify(payload)
    });
    if (res.ok) {
      const data = await res.json();
      if (data.id) document.getElementById('modal-rf-id').value = data.id;
      showToast('Applied', 'Routing filter configuration applied', 'success');
      loadDynamicRouting();
    } else {
      const err = await res.json();
      showToast('Error', err.error || 'Failed to apply filter rule', 'error');
    }
  } catch (err) {
    showToast('Error', err.message, 'error');
  }
}

async function moveRoutingFilterOrder(id, delta) {
  const list = state.routingFilters || [];
  const idx = list.findIndex(r => r.id === id);
  if (idx < 0) return;
  const targetIdx = idx + delta;
  if (targetIdx < 0 || targetIdx >= list.length) return;

  const currentOrder = list[idx].rule_order || 10;
  const targetOrder = list[targetIdx].rule_order || 20;

  list[idx].rule_order = targetOrder;
  list[targetIdx].rule_order = currentOrder;

  try {
    await fetch(`${API_BASE}/routing/filters`, {
      method: 'POST',
      headers: { 'Content-Type': 'application/json' },
      body: JSON.stringify(list[idx])
    });
    await fetch(`${API_BASE}/routing/filters`, {
      method: 'POST',
      headers: { 'Content-Type': 'application/json' },
      body: JSON.stringify(list[targetIdx])
    });
    loadDynamicRouting();
  } catch (e) {
    console.error('Reorder error:', e);
  }
}

async function deleteRoutingFilter(id) {
  if (!confirm('Are you sure you want to delete this routing filter rule?')) return;
  try {
    const res = await fetch(`${API_BASE}/routing/filters/${encodeURIComponent(id)}`, { method: 'DELETE' });
    if (res.ok) {
      showToast('Deleted', 'Routing filter rule removed', 'info');
      loadDynamicRouting();
    } else {
      const err = await res.json();
      showToast('Error', err.error || 'Failed to delete rule', 'error');
    }
  } catch (err) {
    showToast('Error', err.message, 'error');
  }
}

async function toggleRoutingFilterState(id, disabled) {
  try {
    const res = await fetch(`${API_BASE}/routing/filters/${encodeURIComponent(id)}/state`, {
      method: 'POST',
      headers: { 'Content-Type': 'application/json' },
      body: JSON.stringify({ disabled })
    });
    if (res.ok) {
      showToast('Status Updated', `Rule ${disabled ? 'disabled' : 'enabled'}`, 'info');
      loadDynamicRouting();
    } else {
      const err = await res.json();
      showToast('Error', err.error || 'Failed to toggle rule state', 'error');
    }
  } catch (err) {
    showToast('Error', err.message, 'error');
  }
}

// -------------------------------------------------------------
// MODAL CRUD: COMMUNITY LISTS (/routing filter community-list)
// -------------------------------------------------------------

function openAddCommunityListModal() {
  document.getElementById('modal-rf-cl-id').value = '';
  document.getElementById('modal-rf-cl-title').innerText = 'Add BGP Community List';
  document.getElementById('modal-rf-cl-name').value = '';
  document.getElementById('modal-rf-cl-communities').value = '';
  document.getElementById('modal-rf-cl-regexp').value = '';
  document.getElementById('modal-rf-cl-comment').value = '';
  document.getElementById('modal-rf-cl-disabled').checked = false;
  document.getElementById('modal-rf-community-list').classList.remove('hidden');
}

function openEditCommunityListModal(id) {
  const cl = (state.routingCommunityLists || []).find(item => item.id === id);
  if (!cl) return;
  document.getElementById('modal-rf-cl-id').value = cl.id;
  document.getElementById('modal-rf-cl-title').innerText = 'Edit BGP Community List';
  document.getElementById('modal-rf-cl-name').value = cl.name || '';
  document.getElementById('modal-rf-cl-communities').value = (cl.communities || []).join(', ');
  document.getElementById('modal-rf-cl-regexp').value = cl.regexp || '';
  document.getElementById('modal-rf-cl-comment').value = cl.comment || '';
  document.getElementById('modal-rf-cl-disabled').checked = !!cl.disabled;
  document.getElementById('modal-rf-community-list').classList.remove('hidden');
}

function closeCommunityListModal() {
  document.getElementById('modal-rf-community-list').classList.add('hidden');
}

async function submitCommunityList(e) {
  e.preventDefault();
  const rawComms = document.getElementById('modal-rf-cl-communities').value;
  const comms = rawComms.split(',').map(c => c.trim()).filter(Boolean);

  const payload = {
    id: document.getElementById('modal-rf-cl-id').value,
    name: document.getElementById('modal-rf-cl-name').value.trim(),
    communities: comms,
    regexp: document.getElementById('modal-rf-cl-regexp').value.trim(),
    comment: document.getElementById('modal-rf-cl-comment').value.trim(),
    disabled: document.getElementById('modal-rf-cl-disabled').checked
  };

  try {
    const res = await fetch(`${API_BASE}/routing/filters/community-lists`, {
      method: 'POST',
      headers: { 'Content-Type': 'application/json' },
      body: JSON.stringify(payload)
    });
    if (res.ok) {
      closeCommunityListModal();
      showToast('Success', 'Community list saved', 'success');
      loadDynamicRouting();
    } else {
      const err = await res.json();
      showToast('Error', err.error || 'Failed to save community list', 'error');
    }
  } catch (err) {
    showToast('Error', err.message, 'error');
  }
}

async function deleteCommunityList(id) {
  if (!confirm('Are you sure you want to delete this community list?')) return;
  try {
    const res = await fetch(`${API_BASE}/routing/filters/community-lists/${encodeURIComponent(id)}`, { method: 'DELETE' });
    if (res.ok) {
      showToast('Deleted', 'Community list removed', 'info');
      loadDynamicRouting();
    } else {
      const err = await res.json();
      showToast('Error', err.error || 'Failed to delete community list', 'error');
    }
  } catch (err) {
    showToast('Error', err.message, 'error');
  }
}

async function toggleCommunityListState(id, disabled) {
  try {
    const res = await fetch(`${API_BASE}/routing/filters/community-lists/${encodeURIComponent(id)}/state`, {
      method: 'POST',
      headers: { 'Content-Type': 'application/json' },
      body: JSON.stringify({ disabled })
    });
    if (res.ok) {
      showToast('Status Updated', `Community list ${disabled ? 'disabled' : 'enabled'}`, 'info');
      loadDynamicRouting();
    } else {
      const err = await res.json();
      showToast('Error', err.error || 'Failed to update community list state', 'error');
    }
  } catch (err) {
    showToast('Error', err.message, 'error');
  }
}

// -------------------------------------------------------------
// MODAL CRUD: AS LISTS (/routing filter num-list)
// -------------------------------------------------------------

function openAddASListModal() {
  document.getElementById('modal-rf-al-id').value = '';
  document.getElementById('modal-rf-al-title').innerText = 'Add AS Number List';
  document.getElementById('modal-rf-al-name').value = '';
  document.getElementById('modal-rf-al-range').value = '';
  document.getElementById('modal-rf-al-comment').value = '';
  document.getElementById('modal-rf-al-disabled').checked = false;
  document.getElementById('modal-rf-as-list').classList.remove('hidden');
}

function openEditASListModal(id) {
  const al = (state.routingASLists || []).find(item => item.id === id);
  if (!al) return;
  document.getElementById('modal-rf-al-id').value = al.id;
  document.getElementById('modal-rf-al-title').innerText = 'Edit AS Number List';
  document.getElementById('modal-rf-al-name').value = al.name || '';
  document.getElementById('modal-rf-al-range').value = al.range || '';
  document.getElementById('modal-rf-al-comment').value = al.comment || '';
  document.getElementById('modal-rf-al-disabled').checked = !!al.disabled;
  document.getElementById('modal-rf-as-list').classList.remove('hidden');
}

function closeASListModal() {
  document.getElementById('modal-rf-as-list').classList.add('hidden');
}

async function submitASList(e) {
  e.preventDefault();
  const payload = {
    id: document.getElementById('modal-rf-al-id').value,
    name: document.getElementById('modal-rf-al-name').value.trim(),
    range: document.getElementById('modal-rf-al-range').value.trim(),
    comment: document.getElementById('modal-rf-al-comment').value.trim(),
    disabled: document.getElementById('modal-rf-al-disabled').checked
  };

  try {
    const res = await fetch(`${API_BASE}/routing/filters/as-lists`, {
      method: 'POST',
      headers: { 'Content-Type': 'application/json' },
      body: JSON.stringify(payload)
    });
    if (res.ok) {
      closeASListModal();
      showToast('Success', 'AS number list saved', 'success');
      loadDynamicRouting();
    } else {
      const err = await res.json();
      showToast('Error', err.error || 'Failed to save AS list', 'error');
    }
  } catch (err) {
    showToast('Error', err.message, 'error');
  }
}

async function deleteASList(id) {
  if (!confirm('Are you sure you want to delete this AS list?')) return;
  try {
    const res = await fetch(`${API_BASE}/routing/filters/as-lists/${encodeURIComponent(id)}`, { method: 'DELETE' });
    if (res.ok) {
      showToast('Deleted', 'AS list removed', 'info');
      loadDynamicRouting();
    } else {
      const err = await res.json();
      showToast('Error', err.error || 'Failed to delete AS list', 'error');
    }
  } catch (err) {
    showToast('Error', err.message, 'error');
  }
}

async function toggleASListState(id, disabled) {
  try {
    const res = await fetch(`${API_BASE}/routing/filters/as-lists/${encodeURIComponent(id)}/state`, {
      method: 'POST',
      headers: { 'Content-Type': 'application/json' },
      body: JSON.stringify({ disabled })
    });
    if (res.ok) {
      showToast('Status Updated', `AS list ${disabled ? 'disabled' : 'enabled'}`, 'info');
      loadDynamicRouting();
    } else {
      const err = await res.json();
      showToast('Error', err.error || 'Failed to update AS list state', 'error');
    }
  } catch (err) {
    showToast('Error', err.message, 'error');
  }
}

// ==========================================
// TROUBLESHOOT & DIAGNOSTIC TOOLS (/tool)
// ==========================================

function loadToolsView() {
  populateToolsInterfaces();
  switchToolsSubTab(state.activeToolsSubTab || 'ping');
}

function populateToolsInterfaces() {
  const pingSel = document.getElementById('tools-ping-iface');
  const traceSel = document.getElementById('tools-tr-iface');

  let opts = '<option value="">Auto (Default Route)</option>';
  if (Array.isArray(state.interfaces)) {
    state.interfaces.forEach(iface => {
      if (iface.name) {
        opts += `<option value="${escapeHtml(iface.name)}">${escapeHtml(iface.name)}${iface.ip_address ? ' (' + escapeHtml(iface.ip_address) + ')' : ''}</option>`;
      }
    });
  }

  if (pingSel) {
    const cur = pingSel.value;
    pingSel.innerHTML = opts;
    if (cur) pingSel.value = cur;
  }
  if (traceSel) {
    const cur = traceSel.value;
    traceSel.innerHTML = opts;
    if (cur) traceSel.value = cur;
  }
}

function switchToolsSubTab(subTab) {
  state.activeToolsSubTab = subTab;
  const tabs = ['ping', 'traceroute', 'mtr', 'dns', 'port'];

  tabs.forEach(t => {
    const btn = document.getElementById(`tools-subtab-btn-${t}`);
    const view = document.getElementById(`tools-view-${t}`);
    if (btn) {
      if (t === subTab) {
        btn.className = 'px-4 py-2.5 text-xs font-bold border-b-2 border-amber-400 text-amber-300 transition flex items-center gap-2 whitespace-nowrap';
      } else {
        btn.className = 'px-4 py-2.5 text-xs font-bold border-b-2 border-transparent text-slate-400 hover:text-slate-200 transition flex items-center gap-2 whitespace-nowrap';
      }
    }
    if (view) {
      if (t === subTab) {
        view.classList.remove('hidden');
      } else {
        view.classList.add('hidden');
      }
    }
  });
}

function setPortPreset(port) {
  const input = document.getElementById('tools-port-num');
  if (input) input.value = port;
}

let pingAbortController = null;
let tracerouteAbortController = null;

function clearPingTable() {
  const tbody = document.getElementById('tools-ping-tbody');
  if (tbody) tbody.innerHTML = '';
  const rawEl = document.getElementById('tools-ping-raw');
  if (rawEl) rawEl.innerText = '';
  const sentEl = document.getElementById('tools-ping-stat-sent');
  if (sentEl) sentEl.innerText = '0';
  const recvEl = document.getElementById('tools-ping-stat-recv');
  if (recvEl) recvEl.innerText = '0';
  const lossEl = document.getElementById('tools-ping-stat-loss');
  if (lossEl) lossEl.innerText = '0%';
  const avgEl = document.getElementById('tools-ping-stat-avg');
  if (avgEl) avgEl.innerText = '0 ms';
  const minMaxEl = document.getElementById('tools-ping-stat-minmax');
  if (minMaxEl) minMaxEl.innerText = '-';
  const badge = document.getElementById('tools-ping-status-badge');
  if (badge) {
    badge.className = '';
    badge.innerText = '';
  }
}

function clearTracerouteTable() {
  const tbody = document.getElementById('tools-tr-tbody');
  if (tbody) tbody.innerHTML = '';
  const rawEl = document.getElementById('tools-tr-raw');
  if (rawEl) rawEl.innerText = '';
  const statHops = document.getElementById('tools-tr-hops-count');
  if (statHops) statHops.innerText = '0 Hops';
}

function resetPingButton() {
  const btn = document.getElementById('tools-ping-btn');
  const btnText = document.getElementById('tools-ping-btn-text');
  const spinner = document.getElementById('tools-ping-spinner');
  if (btn) {
    btn.disabled = false;
    btn.className = 'px-5 py-2 rounded-lg font-semibold text-xs bg-amber-500 hover:bg-amber-400 text-slate-950 shadow-lg shadow-amber-500/20 transition flex items-center gap-2';
  }
  if (btnText) btnText.innerText = 'Start Ping';
  if (spinner) spinner.classList.add('hidden');
}

function setPingRunningButton() {
  const btn = document.getElementById('tools-ping-btn');
  const btnText = document.getElementById('tools-ping-btn-text');
  const spinner = document.getElementById('tools-ping-spinner');
  if (btn) {
    btn.disabled = false;
    btn.className = 'px-5 py-2 rounded-lg font-semibold text-xs bg-rose-600 hover:bg-rose-500 text-white shadow-lg shadow-rose-600/30 transition flex items-center gap-2';
  }
  if (btnText) btnText.innerText = 'Stop Ping';
  if (spinner) spinner.classList.remove('hidden');
}

function resetTracerouteButton() {
  const btn = document.getElementById('tools-tr-btn');
  const btnText = document.getElementById('tools-tr-btn-text');
  const spinner = document.getElementById('tools-tr-spinner');
  if (btn) {
    btn.disabled = false;
    btn.className = 'px-5 py-2 rounded-lg font-semibold text-xs bg-amber-500 hover:bg-amber-400 text-slate-950 shadow-lg shadow-amber-500/20 transition flex items-center gap-2';
  }
  if (btnText) btnText.innerText = 'Start Traceroute';
  if (spinner) spinner.classList.add('hidden');
}

function setTracerouteRunningButton() {
  const btn = document.getElementById('tools-tr-btn');
  const btnText = document.getElementById('tools-tr-btn-text');
  const spinner = document.getElementById('tools-tr-spinner');
  if (btn) {
    btn.disabled = false;
    btn.className = 'px-5 py-2 rounded-lg font-semibold text-xs bg-rose-600 hover:bg-rose-500 text-white shadow-lg shadow-rose-600/30 transition flex items-center gap-2';
  }
  if (btnText) btnText.innerText = 'Stop Traceroute';
  if (spinner) spinner.classList.remove('hidden');
}

async function executePing(e) {
  if (e) e.preventDefault();

  // If already running, clicking the button stops the stream!
  if (pingAbortController) {
    pingAbortController.abort();
    pingAbortController = null;
    resetPingButton();
    showToast('Ping Stopped', 'Live ping stopped by user', 'info');
    return;
  }

  const target = document.getElementById('tools-ping-target')?.value?.trim();
  const count = parseInt(document.getElementById('tools-ping-count')?.value || '4', 10);
  const size = parseInt(document.getElementById('tools-ping-size')?.value || '56', 10);
  const timeout = parseInt(document.getElementById('tools-ping-timeout')?.value || '3', 10);
  const iface = document.getElementById('tools-ping-iface')?.value || '';
  const dontFrag = document.getElementById('tools-ping-df')?.checked || false;

  if (!target) {
    showToast('Input Required', 'Please enter a target host or IP', 'warning');
    return;
  }

  clearPingTable();
  const resCard = document.getElementById('tools-ping-results');
  if (resCard) resCard.classList.remove('hidden');

  pingAbortController = new AbortController();
  setPingRunningButton();

  try {
    const res = await fetch(`${API_BASE}/tools/ping/stream`, {
      method: 'POST',
      headers: { 'Content-Type': 'application/json' },
      body: JSON.stringify({
        target,
        count,
        size,
        timeout,
        interface: iface,
        dont_frag: dontFrag
      }),
      signal: pingAbortController.signal
    });

    if (!res.ok) {
      const errText = await res.text();
      showToast('Ping Error', errText || 'Failed to start live ping', 'error');
      resetPingButton();
      pingAbortController = null;
      return;
    }

    const reader = res.body.getReader();
    const decoder = new TextDecoder('utf-8');
    let buffer = '';

    while (true) {
      const { done, value } = await reader.read();
      if (done) break;

      buffer += decoder.decode(value, { stream: true });
      const blocks = buffer.split('\n\n');
      buffer = blocks.pop() || '';

      for (const block of blocks) {
        const trimmed = block.trim();
        if (!trimmed) continue;
        const line = trimmed.startsWith('data: ') ? trimmed.slice(6) : trimmed;
        try {
          const evt = JSON.parse(line);
          handleLivePingEvent(evt);
        } catch (parseErr) {
          console.warn('Ping SSE parse error:', parseErr, line);
        }
      }
    }
  } catch (err) {
    if (err.name === 'AbortError') {
      // User aborted normally
    } else {
      showToast('Ping Error', err.message, 'error');
    }
  } finally {
    pingAbortController = null;
    resetPingButton();
  }
}

function handleLivePingEvent(evt) {
  const sentEl = document.getElementById('tools-ping-stat-sent');
  const recvEl = document.getElementById('tools-ping-stat-recv');
  const lossEl = document.getElementById('tools-ping-stat-loss');
  const avgEl = document.getElementById('tools-ping-stat-avg');
  const minMaxEl = document.getElementById('tools-ping-stat-minmax');
  const badge = document.getElementById('tools-ping-status-badge');
  const tbody = document.getElementById('tools-ping-tbody');
  const rawEl = document.getElementById('tools-ping-raw');

  if (evt.raw && rawEl) {
    rawEl.innerText += (rawEl.innerText ? '\n' : '') + evt.raw;
    rawEl.scrollTop = rawEl.scrollHeight;
  }

  if (evt.type === 'reply') {
    if (sentEl && evt.packets_sent !== undefined) sentEl.innerText = evt.packets_sent;
    if (recvEl && evt.packets_recv !== undefined) recvEl.innerText = evt.packets_recv;
    if (lossEl && evt.packet_loss_pct !== undefined) {
      lossEl.innerText = `${evt.packet_loss_pct.toFixed(0)}%`;
      lossEl.className = evt.packet_loss_pct === 0 
        ? 'text-base font-bold font-mono text-emerald-400 mt-1' 
        : (evt.packet_loss_pct < 50 ? 'text-base font-bold font-mono text-amber-400 mt-1' : 'text-base font-bold font-mono text-rose-400 mt-1');
    }
    if (avgEl && evt.avg_rtt_ms !== undefined) avgEl.innerText = `${evt.avg_rtt_ms.toFixed(2)} ms`;
    if (minMaxEl && evt.min_rtt_ms !== undefined && evt.max_rtt_ms !== undefined) {
      minMaxEl.innerText = `${evt.min_rtt_ms.toFixed(1)} / ${evt.max_rtt_ms.toFixed(1)} ms`;
    }
    if (badge) {
      if (evt.packet_loss_pct === 0) {
        badge.className = 'px-2 py-0.5 rounded text-[10px] font-mono font-semibold bg-emerald-950 text-emerald-300 border border-emerald-800/60';
        badge.innerText = '100% OK';
      } else {
        badge.className = 'px-2 py-0.5 rounded text-[10px] font-mono font-semibold bg-amber-950 text-amber-300 border border-amber-800/60';
        badge.innerText = `${evt.packet_loss_pct.toFixed(0)}% LOSS`;
      }
    }

    if (tbody) {
      const tr = document.createElement('tr');
      tr.className = 'hover:bg-slate-800/40 border-b border-slate-800/60 font-mono text-xs';
      tr.innerHTML = `
        <td class="py-2 px-3 text-slate-300">#${evt.seq}</td>
        <td class="py-2 px-3 font-semibold text-white">${escapeHtml(evt.from)}</td>
        <td class="py-2 px-3 text-slate-400">${evt.bytes} bytes</td>
        <td class="py-2 px-3 text-slate-300">${evt.ttl}</td>
        <td class="py-2 px-3 font-bold text-amber-300">${evt.time_ms.toFixed(2)} ms</td>
        <td class="py-2 px-3 text-right"><span class="px-2 py-0.5 rounded text-[10px] font-bold bg-emerald-950 text-emerald-300 border border-emerald-800/60">REPLY</span></td>
      `;
      tbody.appendChild(tr);
    }
  } else if (evt.type === 'timeout') {
    if (sentEl && evt.packets_sent !== undefined) sentEl.innerText = evt.packets_sent;
    if (lossEl && evt.packet_loss_pct !== undefined) {
      lossEl.innerText = `${evt.packet_loss_pct.toFixed(0)}%`;
      lossEl.className = evt.packet_loss_pct < 50 ? 'text-base font-bold font-mono text-amber-400 mt-1' : 'text-base font-bold font-mono text-rose-400 mt-1';
    }
    if (badge) {
      badge.className = 'px-2 py-0.5 rounded text-[10px] font-mono font-semibold bg-rose-950 text-rose-300 border border-rose-800/60';
      badge.innerText = `${evt.packet_loss_pct?.toFixed(0) || 100}% LOSS`;
    }

    if (tbody) {
      const tr = document.createElement('tr');
      tr.className = 'hover:bg-slate-800/40 border-b border-slate-800/60 font-mono text-xs opacity-75';
      tr.innerHTML = `
        <td class="py-2 px-3 text-slate-400">#${evt.seq}</td>
        <td class="py-2 px-3 font-semibold text-slate-500 italic">Request timed out</td>
        <td class="py-2 px-3 text-slate-600">--</td>
        <td class="py-2 px-3 text-slate-600">--</td>
        <td class="py-2 px-3 font-bold text-slate-500">* * *</td>
        <td class="py-2 px-3 text-right"><span class="px-2 py-0.5 rounded text-[10px] font-bold bg-slate-800 text-slate-400 border border-slate-700">TIMEOUT</span></td>
      `;
      tbody.appendChild(tr);
    }
  } else if (evt.type === 'unreach') {
    if (sentEl && evt.packets_sent !== undefined) sentEl.innerText = evt.packets_sent;
    if (lossEl && evt.packet_loss_pct !== undefined) {
      lossEl.innerText = `${evt.packet_loss_pct.toFixed(0)}%`;
      lossEl.className = 'text-base font-bold font-mono text-rose-400 mt-1';
    }
    if (badge) {
      badge.className = 'px-2 py-0.5 rounded text-[10px] font-mono font-semibold bg-rose-950 text-rose-300 border border-rose-800/60';
      badge.innerText = 'UNREACHABLE';
    }

    if (tbody) {
      const tr = document.createElement('tr');
      tr.className = 'hover:bg-slate-800/40 border-b border-slate-800/60 font-mono text-xs';
      tr.innerHTML = `
        <td class="py-2 px-3 text-slate-400">#${evt.seq}</td>
        <td class="py-2 px-3 font-semibold text-rose-400">${escapeHtml(evt.from || 'Gateway')}</td>
        <td class="py-2 px-3 text-slate-600">--</td>
        <td class="py-2 px-3 text-slate-600">--</td>
        <td class="py-2 px-3 font-bold text-rose-400 text-xs">${escapeHtml(evt.message || 'Unreachable')}</td>
        <td class="py-2 px-3 text-right"><span class="px-2 py-0.5 rounded text-[10px] font-bold bg-rose-950 text-rose-300 border border-rose-800/60">UNREACH</span></td>
      `;
      tbody.appendChild(tr);
    }
  } else if (evt.type === 'stats') {
    if (sentEl && evt.packets_sent !== undefined) sentEl.innerText = evt.packets_sent;
    if (recvEl && evt.packets_recv !== undefined) recvEl.innerText = evt.packets_recv;
    if (lossEl && evt.packet_loss_pct !== undefined) lossEl.innerText = `${evt.packet_loss_pct.toFixed(0)}%`;
    if (avgEl && evt.avg_rtt_ms !== undefined) avgEl.innerText = `${evt.avg_rtt_ms.toFixed(2)} ms`;
    if (minMaxEl && evt.min_rtt_ms !== undefined && evt.max_rtt_ms !== undefined) {
      minMaxEl.innerText = `${evt.min_rtt_ms.toFixed(1)} / ${evt.max_rtt_ms.toFixed(1)} ms`;
    }
  } else if (evt.type === 'done') {
    showToast('Ping Finished', `Sent ${evt.packets_sent}, received ${evt.packets_recv} (${evt.packet_loss_pct?.toFixed(0)}% loss)`, evt.packet_loss_pct === 0 ? 'success' : 'info');
  }
}

async function executeTraceroute(e) {
  if (e) e.preventDefault();

  if (tracerouteAbortController) {
    tracerouteAbortController.abort();
    tracerouteAbortController = null;
    resetTracerouteButton();
    showToast('Traceroute Stopped', 'Traceroute stopped by user', 'info');
    return;
  }

  const target = document.getElementById('tools-tr-target')?.value?.trim();
  const maxHops = parseInt(document.getElementById('tools-tr-maxhops')?.value || '15', 10);
  const protocol = document.getElementById('tools-tr-proto')?.value || 'icmp';
  const iface = document.getElementById('tools-tr-iface')?.value || '';
  const resolve = document.getElementById('tools-tr-resolve')?.checked || false;

  if (!target) {
    showToast('Input Required', 'Please enter a target host or IP', 'warning');
    return;
  }

  clearTracerouteTable();
  const resCard = document.getElementById('tools-tr-results');
  if (resCard) resCard.classList.remove('hidden');

  tracerouteAbortController = new AbortController();
  setTracerouteRunningButton();

  try {
    const res = await fetch(`${API_BASE}/tools/traceroute/stream`, {
      method: 'POST',
      headers: { 'Content-Type': 'application/json' },
      body: JSON.stringify({
        target,
        max_hops: maxHops,
        protocol,
        interface: iface,
        resolve
      }),
      signal: tracerouteAbortController.signal
    });

    if (!res.ok) {
      const errText = await res.text();
      showToast('Traceroute Error', errText || 'Failed to start traceroute', 'error');
      resetTracerouteButton();
      tracerouteAbortController = null;
      return;
    }

    const reader = res.body.getReader();
    const decoder = new TextDecoder('utf-8');
    let buffer = '';

    while (true) {
      const { done, value } = await reader.read();
      if (done) break;

      buffer += decoder.decode(value, { stream: true });
      const blocks = buffer.split('\n\n');
      buffer = blocks.pop() || '';

      for (const block of blocks) {
        const trimmed = block.trim();
        if (!trimmed) continue;
        const line = trimmed.startsWith('data: ') ? trimmed.slice(6) : trimmed;
        try {
          const evt = JSON.parse(line);
          handleLiveTracerouteEvent(evt);
        } catch (parseErr) {
          console.warn('Traceroute SSE parse error:', parseErr, line);
        }
      }
    }
  } catch (err) {
    if (err.name === 'AbortError') {
      // User aborted normally
    } else {
      showToast('Traceroute Error', err.message, 'error');
    }
  } finally {
    tracerouteAbortController = null;
    resetTracerouteButton();
  }
}

function handleLiveTracerouteEvent(evt) {
  const statHops = document.getElementById('tools-tr-hops-count');
  const tbody = document.getElementById('tools-tr-tbody');
  const rawEl = document.getElementById('tools-tr-raw');

  if (evt.raw && rawEl) {
    rawEl.innerText += (rawEl.innerText ? '\n' : '') + evt.raw;
    rawEl.scrollTop = rawEl.scrollHeight;
  }

  if (evt.hops_count !== undefined && statHops) {
    statHops.innerText = `${evt.hops_count} Hops`;
  }

  if (evt.type === 'hop' && evt.hop && tbody) {
    const h = evt.hop;
    const isTimeout = h.status === 'timeout' || (!h.ip && !h.host);
    const rtt1 = Array.isArray(h.times_ms) && h.times_ms[0] ? `${h.times_ms[0]} ms` : (isTimeout ? '*' : '--');
    const rtt2 = Array.isArray(h.times_ms) && h.times_ms[1] ? `${h.times_ms[1]} ms` : (isTimeout ? '*' : '--');
    const displayHost = h.host && h.host !== h.ip ? `${escapeHtml(h.host)} (${escapeHtml(h.ip || '')})` : escapeHtml(h.ip || (isTimeout ? 'Request timed out' : '--'));

    const tr = document.createElement('tr');
    tr.className = `hover:bg-slate-800/40 border-b border-slate-800/60 font-mono text-xs ${isTimeout ? 'opacity-60' : ''}`;
    tr.innerHTML = `
      <td class="py-2.5 px-3 text-slate-300 font-bold">${h.hop}</td>
      <td class="py-2.5 px-3 font-semibold ${isTimeout ? 'text-slate-500 italic' : 'text-cyan-300'}">${displayHost}</td>
      <td class="py-2.5 px-3 font-bold ${isTimeout ? 'text-slate-500' : 'text-amber-300'}">${escapeHtml(rtt1)}</td>
      <td class="py-2.5 px-3 font-bold ${isTimeout ? 'text-slate-500' : 'text-amber-300'}">${escapeHtml(rtt2)}</td>
      <td class="py-2.5 px-3 text-right">
        ${isTimeout 
          ? '<span class="px-2 py-0.5 rounded text-[10px] font-bold bg-slate-800 text-slate-400 border border-slate-700">TIMEOUT</span>' 
          : '<span class="px-2 py-0.5 rounded text-[10px] font-bold bg-emerald-950 text-emerald-300 border border-emerald-800/60">OK</span>'}
      </td>
    `;
    tbody.appendChild(tr);
  } else if (evt.type === 'done') {
    showToast('Traceroute Finished', `Traced ${evt.hops_count || 0} hops`, 'info');
  }
}

async function executeMTR(e) {
  if (e) e.preventDefault();
  const target = document.getElementById('tools-mtr-target')?.value?.trim();
  const cycles = parseInt(document.getElementById('tools-mtr-count')?.value || '3', 10);

  if (!target) {
    showToast('Input Required', 'Please enter a target host or IP', 'warning');
    return;
  }

  const btn = document.getElementById('tools-mtr-btn');
  const spinner = document.getElementById('tools-mtr-spinner');
  if (btn) btn.disabled = true;
  if (spinner) spinner.classList.remove('hidden');

  try {
    const res = await fetch(`${API_BASE}/tools/mtr`, {
      method: 'POST',
      headers: { 'Content-Type': 'application/json' },
      body: JSON.stringify({ target, count: cycles })
    });

    const data = await res.json();
    if (!res.ok) {
      showToast('MTR Error', data.error || 'Failed to execute MTR', 'error');
      return;
    }

    const resCard = document.getElementById('tools-mtr-results');
    if (resCard) resCard.classList.remove('hidden');

    const hopsCount = Array.isArray(data.hops) ? data.hops.length : 0;
    const statHops = document.getElementById('tools-mtr-hops-count');
    if (statHops) statHops.innerText = `${hopsCount} Hops`;

    const tbody = document.getElementById('tools-mtr-tbody');
    if (tbody) {
      if (hopsCount > 0) {
        tbody.innerHTML = data.hops.map(h => {
          const lossClass = h.loss_pct === 0 ? 'text-emerald-400 font-bold' : (h.loss_pct < 20 ? 'text-amber-400 font-bold' : 'text-rose-400 font-bold');
          return `
            <tr class="hover:bg-slate-800/40 border-b border-slate-800/60 font-mono text-xs">
              <td class="py-2.5 px-3 text-slate-300 font-bold">${h.hop}</td>
              <td class="py-2.5 px-3 font-semibold text-white">${escapeHtml(h.host || '--')}</td>
              <td class="py-2.5 px-3 ${lossClass}">${h.loss_pct.toFixed(1)}%</td>
              <td class="py-2.5 px-3 text-slate-300">${h.sent}</td>
              <td class="py-2.5 px-3 text-slate-300">${h.last_ms.toFixed(1)}</td>
              <td class="py-2.5 px-3 font-bold text-amber-300">${h.avg_ms.toFixed(1)}</td>
              <td class="py-2.5 px-3 text-emerald-400">${h.best_ms.toFixed(1)}</td>
              <td class="py-2.5 px-3 text-rose-400">${h.wrst_ms.toFixed(1)}</td>
              <td class="py-2.5 px-3 text-slate-400">${h.stdev_ms.toFixed(1)}</td>
            </tr>
          `;
        }).join('');
      } else {
        tbody.innerHTML = `<tr><td colspan="9" class="p-4 text-center text-xs text-rose-400 font-mono">No MTR data collected</td></tr>`;
      }
    }

    const rawEl = document.getElementById('tools-mtr-raw');
    if (rawEl) rawEl.innerText = data.raw_output || 'No output';

    showToast('MTR Finished', `Report completed (${hopsCount} hops discovered)`, 'info');
  } catch (err) {
    showToast('MTR Error', err.message, 'error');
  } finally {
    if (btn) btn.disabled = false;
    if (spinner) spinner.classList.add('hidden');
  }
}

async function executeDNS(e) {
  if (e) e.preventDefault();
  const domain = document.getElementById('tools-dns-domain')?.value?.trim();
  const type = document.getElementById('tools-dns-type')?.value || 'A';
  const server = document.getElementById('tools-dns-server')?.value?.trim() || '';

  if (!domain) {
    showToast('Input Required', 'Please enter a hostname or domain', 'warning');
    return;
  }

  const btn = document.getElementById('tools-dns-btn');
  const spinner = document.getElementById('tools-dns-spinner');
  if (btn) btn.disabled = true;
  if (spinner) spinner.classList.remove('hidden');

  try {
    const res = await fetch(`${API_BASE}/tools/dns`, {
      method: 'POST',
      headers: { 'Content-Type': 'application/json' },
      body: JSON.stringify({ domain, type, server })
    });

    const data = await res.json();
    if (!res.ok) {
      showToast('DNS Error', data.error || 'Failed to resolve DNS query', 'error');
      return;
    }

    const resCard = document.getElementById('tools-dns-results');
    if (resCard) resCard.classList.remove('hidden');

    const metaEl = document.getElementById('tools-dns-meta');
    if (metaEl) metaEl.innerText = `Resolved in ${data.query_time_ms ?? 0} ms via ${escapeHtml(data.server || 'System DNS')}`;

    const tbody = document.getElementById('tools-dns-tbody');
    if (tbody) {
      if (Array.isArray(data.records) && data.records.length > 0) {
        tbody.innerHTML = data.records.map(r => `
          <tr class="hover:bg-slate-800/40 border-b border-slate-800/60 font-mono text-xs">
            <td class="py-2.5 px-3 font-semibold text-white">${escapeHtml(r.name)}</td>
            <td class="py-2.5 px-3 text-slate-400">${r.ttl}s</td>
            <td class="py-2.5 px-3 text-slate-400">${escapeHtml(r.class || 'IN')}</td>
            <td class="py-2.5 px-3"><span class="px-2 py-0.5 rounded text-[10px] font-bold bg-cyan-950 text-cyan-300 border border-cyan-800/60">${escapeHtml(r.type)}</span></td>
            <td class="py-2.5 px-3 font-bold text-amber-300 break-all">${escapeHtml(r.value)}</td>
          </tr>
        `).join('');
      } else {
        tbody.innerHTML = `<tr><td colspan="5" class="p-4 text-center text-xs text-amber-400 font-mono">No answer records returned for ${escapeHtml(type)} query</td></tr>`;
      }
    }

    const rawEl = document.getElementById('tools-dns-raw');
    if (rawEl) rawEl.innerText = data.raw_output || 'No output';

    showToast('DNS Lookup Done', `Resolved ${domain} in ${data.query_time_ms} ms`, 'success');
  } catch (err) {
    showToast('DNS Error', err.message, 'error');
  } finally {
    if (btn) btn.disabled = false;
    if (spinner) spinner.classList.add('hidden');
  }
}

async function executePortProbe(e) {
  if (e) e.preventDefault();
  const target = document.getElementById('tools-port-target')?.value?.trim();
  const port = parseInt(document.getElementById('tools-port-num')?.value || '80', 10);
  const timeout = parseInt(document.getElementById('tools-port-timeout')?.value || '3', 10);

  if (!target || !port) {
    showToast('Input Required', 'Please enter a target host and TCP port', 'warning');
    return;
  }

  const btn = document.getElementById('tools-port-btn');
  const spinner = document.getElementById('tools-port-spinner');
  if (btn) btn.disabled = true;
  if (spinner) spinner.classList.remove('hidden');

  try {
    const res = await fetch(`${API_BASE}/tools/port-probe`, {
      method: 'POST',
      headers: { 'Content-Type': 'application/json' },
      body: JSON.stringify({ target, port, timeout })
    });

    const data = await res.json();
    if (!res.ok) {
      showToast('Probe Error', data.error || 'Failed to probe TCP port', 'error');
      return;
    }

    const resCard = document.getElementById('tools-port-results');
    if (resCard) resCard.classList.remove('hidden');

    const banner = document.getElementById('tools-port-banner');
    const icon = document.getElementById('tools-port-icon');
    const title = document.getElementById('tools-port-title');
    const sub = document.getElementById('tools-port-sub');
    const latency = document.getElementById('tools-port-latency');

    if (data.open) {
      if (banner) banner.className = 'rounded-xl p-5 border bg-emerald-950/30 border-emerald-800/50 flex items-center justify-between';
      if (icon) {
        icon.className = 'w-8 h-8 rounded-full flex items-center justify-center font-bold text-sm bg-emerald-500/20 text-emerald-400 border border-emerald-500/40';
        icon.innerText = '✓';
      }
      if (title) {
        title.className = 'text-sm font-bold text-emerald-300';
        title.innerText = `PORT ${port} OPEN / LISTENING`;
      }
      if (sub) {
        sub.className = 'text-xs mt-0.5 font-mono text-emerald-400/80';
        sub.innerText = `TCP 3-way handshake established with ${escapeHtml(target)}:${port}${data.service ? ' (' + escapeHtml(data.service) + ')' : ''}`;
      }
      if (latency) {
        latency.className = 'text-base font-bold font-mono text-emerald-300';
        latency.innerText = `${data.latency_ms.toFixed(2)} ms`;
      }
    } else {
      if (banner) banner.className = 'rounded-xl p-5 border bg-rose-950/30 border-rose-800/50 flex items-center justify-between';
      if (icon) {
        icon.className = 'w-8 h-8 rounded-full flex items-center justify-center font-bold text-sm bg-rose-500/20 text-rose-400 border border-rose-500/40';
        icon.innerText = '✕';
      }
      if (title) {
        title.className = 'text-sm font-bold text-rose-300';
        title.innerText = `PORT ${port} CLOSED / FILTERED`;
      }
      if (sub) {
        sub.className = 'text-xs mt-0.5 font-mono text-rose-400/80';
        sub.innerText = `Connection failed or timed out to ${escapeHtml(target)}:${port}`;
      }
      if (latency) {
        latency.className = 'text-base font-bold font-mono text-slate-500';
        latency.innerText = '--';
      }
    }

    const rawEl = document.getElementById('tools-port-raw');
    if (rawEl) rawEl.innerText = data.raw_output || (data.open ? `Successfully connected to ${target}:${port} in ${data.latency_ms} ms` : `Connection failed: ${data.error || 'timed out or connection refused'}`);

    showToast('Probe Complete', `Port ${port} is ${data.open ? 'OPEN' : 'CLOSED'}`, data.open ? 'success' : 'warning');
  } catch (err) {
    showToast('Probe Error', err.message, 'error');
  } finally {
    if (btn) btn.disabled = false;
    if (spinner) spinner.classList.add('hidden');
  }
}

// ==========================================
// DHCP CLIENT (/ip dhcp-client) CONTROLLER
// ==========================================

async function loadDHCPClients(showToastMsg = false) {
  try {
    const [clientsRes, sumRes] = await Promise.all([
      fetch(`${API_BASE}/dhcp/clients`),
      fetch(`${API_BASE}/dhcp/clients/summary`)
    ]);

    if (clientsRes.ok) {
      state.dhcpClients = await clientsRes.json();
    }
    if (sumRes.ok) {
      state.dhcpSummary = await sumRes.json();
    }

    renderDHCPClients();
    updateDHCPSummaryCards();

    const bDhcp = document.getElementById('badge-dhcp-client-count');
    if (bDhcp && state.dhcpSummary) {
      bDhcp.innerText = state.dhcpSummary.total_clients || 0;
    }

    if (showToastMsg) {
      showToast('Refreshed', 'DHCP Client telemetry updated', 'info');
    }
  } catch (err) {
    console.error('Failed to load DHCP clients:', err);
    if (showToastMsg) {
      showToast('Notice', 'Unable to fetch DHCP client status', 'warning');
    }
  }
}

function updateDHCPSummaryCards() {
  const sum = state.dhcpSummary || {
    total_clients: (state.dhcpClients || []).length,
    bound_clients: (state.dhcpClients || []).filter(c => c.status === 'bound').length,
    searching_clients: (state.dhcpClients || []).filter(c => c.status === 'searching').length,
    disabled_clients: (state.dhcpClients || []).filter(c => !c.enabled).length
  };

  const totalEl = document.getElementById('dhcp-stat-total');
  const boundEl = document.getElementById('dhcp-stat-bound');
  const searchEl = document.getElementById('dhcp-stat-searching');
  const disEl = document.getElementById('dhcp-stat-disabled');

  if (totalEl) totalEl.innerText = sum.total_clients ?? 0;
  if (boundEl) boundEl.innerText = sum.bound_clients ?? 0;
  if (searchEl) searchEl.innerText = sum.searching_clients ?? 0;
  if (disEl) disEl.innerText = sum.disabled_clients ?? 0;
}

function renderDHCPClients() {
  const tbody = document.getElementById('dhcp-clients-tbody');
  const emptyState = document.getElementById('dhcp-clients-empty');
  if (!tbody) return;

  const clients = Array.isArray(state.dhcpClients) ? state.dhcpClients : [];

  if (clients.length === 0) {
    tbody.innerHTML = '';
    if (emptyState) emptyState.classList.remove('hidden');
    return;
  }
  if (emptyState) emptyState.classList.add('hidden');

  const sig = clients.map(c => `${c.id}:${c.status}:${c.ip_address}:${c.gateway}:${c.enabled}`).join(';');
  if (tbody.dataset.sig === sig) return;
  tbody.dataset.sig = sig;

  tbody.innerHTML = clients.map(c => {
    let statusBadge = '';
    if (!c.enabled) {
      statusBadge = '<span class="px-2 py-0.5 rounded text-[10px] font-bold bg-slate-800 text-slate-400 border border-slate-700">DISABLED</span>';
    } else if (c.status === 'bound') {
      statusBadge = '<span class="px-2 py-0.5 rounded text-[10px] font-bold bg-emerald-950 text-emerald-300 border border-emerald-800/60 inline-flex items-center gap-1.5"><span class="w-1.5 h-1.5 rounded-full bg-emerald-400 animate-pulse"></span>BOUND</span>';
    } else if (c.status === 'searching') {
      statusBadge = '<span class="px-2 py-0.5 rounded text-[10px] font-bold bg-amber-950 text-amber-300 border border-amber-800/60 inline-flex items-center gap-1.5"><span class="w-1.5 h-1.5 rounded-full bg-amber-400 animate-ping"></span>SEARCHING...</span>';
    } else if (c.status === 'stopped') {
      statusBadge = '<span class="px-2 py-0.5 rounded text-[10px] font-bold bg-slate-800 text-slate-400 border border-slate-700">STOPPED</span>';
    } else {
      statusBadge = `<span class="px-2 py-0.5 rounded text-[10px] font-bold bg-rose-950 text-rose-300 border border-rose-800/60">${escapeHtml((c.status || 'UNKNOWN').toUpperCase())}</span>`;
    }

    const ipDisplay = c.ip_address ? `<span class="font-bold text-white">${escapeHtml(c.ip_address)}</span>` : '<span class="text-slate-500 italic">No lease</span>';
    const gwDisplay = c.gateway ? `<span class="text-slate-300">${escapeHtml(c.gateway)}</span>` : '<span class="text-slate-600">--</span>';
    const srvDisplay = c.dhcp_server ? `<span class="text-slate-300">${escapeHtml(c.dhcp_server)}</span>` : '<span class="text-slate-600">--</span>';
    const dnsDisplay = (Array.isArray(c.dns_servers) && c.dns_servers.length > 0) ? `<span class="text-cyan-400">${c.dns_servers.map(d => escapeHtml(d)).join(', ')}</span>` : '<span class="text-slate-600">--</span>';
    const expDisplay = c.expires_in ? `<span class="text-purple-300">${escapeHtml(c.expires_in)}</span>` : '<span class="text-slate-600">--</span>';

    // Option flags
    const flags = [];
    if (c.add_default_route) flags.push('<span class="px-1.5 py-0.5 rounded text-[10px] bg-slate-800 text-slate-300 border border-slate-700" title="Add Default Route">+GW</span>');
    if (c.use_peer_dns) flags.push('<span class="px-1.5 py-0.5 rounded text-[10px] bg-cyan-950/60 text-cyan-300 border border-cyan-800/50" title="Use Peer DNS">+DNS</span>');
    if (c.use_peer_ntp) flags.push('<span class="px-1.5 py-0.5 rounded text-[10px] bg-indigo-950/60 text-indigo-300 border border-indigo-800/50" title="Use Peer NTP">+NTP</span>');
    flags.push(`<span class="px-1.5 py-0.5 rounded text-[10px] bg-slate-800/60 text-slate-400" title="Default Route Distance">dist:${c.default_route_distance || 1}</span>`);

    return `
      <tr class="hover:bg-slate-800/40 border-b border-slate-800/60 text-xs transition">
        <td class="py-3 px-4">
          <div class="flex items-center gap-2">
            <span class="font-bold text-white text-sm">${escapeHtml(c.interface)}</span>
            ${c.comment ? `<span class="text-[11px] text-slate-400 font-sans italic">(${escapeHtml(c.comment)})</span>` : ''}
          </div>
        </td>
        <td class="py-3 px-4">${statusBadge}</td>
        <td class="py-3 px-4 font-mono">${ipDisplay}</td>
        <td class="py-3 px-4 font-mono">${gwDisplay}</td>
        <td class="py-3 px-4 font-mono">${srvDisplay}</td>
        <td class="py-3 px-4 font-mono text-[11px]">${dnsDisplay}</td>
        <td class="py-3 px-4 font-mono text-[11px]">${expDisplay}</td>
        <td class="py-3 px-4">
          <div class="flex flex-wrap gap-1 font-mono">${flags.join('')}</div>
        </td>
        <td class="py-3 px-4 text-right space-x-1.5 font-sans whitespace-nowrap">
          ${c.enabled ? `
            <button onclick="renewDHCPClient('${c.id}')" class="px-2 py-1 rounded bg-slate-800 hover:bg-slate-700 text-amber-400 text-xs font-medium border border-slate-700 transition" title="Renew Lease">Renew</button>
            <button onclick="releaseDHCPClient('${c.id}')" class="px-2 py-1 rounded bg-slate-800 hover:bg-slate-700 text-slate-300 text-xs font-medium border border-slate-700 transition" title="Release Lease">Release</button>
            <button onclick="toggleDHCPClientState('${c.id}', false)" class="px-2 py-1 rounded bg-amber-500/10 hover:bg-amber-500/20 text-amber-400 text-xs font-medium border border-amber-500/30 transition" title="Disable DHCP Client">Disable</button>
          ` : `
            <button onclick="toggleDHCPClientState('${c.id}', true)" class="px-2.5 py-1 rounded bg-emerald-500/10 hover:bg-emerald-500/20 text-emerald-400 text-xs font-semibold border border-emerald-500/30 transition" title="Enable DHCP Client">Enable</button>
          `}
          <button onclick="openDHCPClientModal('${c.id}')" class="px-2 py-1 rounded bg-slate-800 hover:bg-slate-700 text-white text-xs font-medium border border-slate-700 transition" title="Edit Settings">Edit</button>
          <button onclick="deleteDHCPClient('${c.id}', '${c.interface}')" class="px-2 py-1 rounded bg-rose-500/10 hover:bg-rose-500/20 text-rose-400 text-xs font-medium border border-rose-500/30 transition" title="Remove Client">✕</button>
        </td>
      </tr>
    `;
  }).join('');
}

function openDHCPClientModal(clientId = null) {
  const modal = document.getElementById('modal-dhcp-client');
  if (!modal) return;

  const title = document.getElementById('modal-dhcp-title');
  const idInput = document.getElementById('modal-dhcp-id');
  const ifaceSelect = document.getElementById('modal-dhcp-iface');
  const distInput = document.getElementById('modal-dhcp-distance');
  const commentInput = document.getElementById('modal-dhcp-comment');
  const defRouteCheck = document.getElementById('modal-dhcp-def-route');
  const peerDnsCheck = document.getElementById('modal-dhcp-peer-dns');
  const peerNtpCheck = document.getElementById('modal-dhcp-peer-ntp');
  const enabledCheck = document.getElementById('modal-dhcp-enabled');

  // Populate interfaces
  if (ifaceSelect) {
    let opts = '<option value="">Select interface...</option>';
    const allIfaces = state.interfaces || [];
    const allVlans = state.vlans || [];
    const usedIfaces = new Set((state.dhcpClients || []).map(c => c.interface));

    // Group 1: Physical & Bridge Interfaces
    opts += '<optgroup label="Physical & Bridge Interfaces">';
    allIfaces.filter(i => supportsDHCPClient(i)).forEach(i => {
      const isConfigured = usedIfaces.has(i.name) ? ' (Configured)' : '';
      opts += `<option value="${escapeHtml(i.name)}">${escapeHtml(i.name)} [${escapeHtml(i.role || i.type)}]${isConfigured}</option>`;
    });
    opts += '</optgroup>';

    // Group 2: VLAN Interfaces
    if (allVlans.length > 0) {
      opts += '<optgroup label="802.1Q VLAN Sub-interfaces">';
      allVlans.forEach(v => {
        const isConfigured = usedIfaces.has(v.name) ? ' (Configured)' : '';
        opts += `<option value="${escapeHtml(v.name)}">${escapeHtml(v.name)} (VLAN ${v.vlan_id})${isConfigured}</option>`;
      });
      opts += '</optgroup>';
    }

    ifaceSelect.innerHTML = opts;
  }

  if (clientId) {
    const client = (state.dhcpClients || []).find(c => c.id === clientId);
    if (client) {
      if (title) title.innerText = `Edit DHCP Client: ${client.interface}`;
      if (idInput) idInput.value = client.id;
      if (ifaceSelect) {
        ifaceSelect.value = client.interface;
        ifaceSelect.disabled = true; // interface cannot be changed on edit
      }
      if (distInput) distInput.value = client.default_route_distance || 1;
      if (commentInput) commentInput.value = client.comment || '';
      if (defRouteCheck) defRouteCheck.checked = client.add_default_route !== false;
      if (peerDnsCheck) peerDnsCheck.checked = client.use_peer_dns !== false;
      if (peerNtpCheck) peerNtpCheck.checked = client.use_peer_ntp !== false;
      if (enabledCheck) enabledCheck.checked = client.enabled !== false;
    }
  } else {
    if (title) title.innerText = 'Add DHCP Client';
    if (idInput) idInput.value = '';
    if (ifaceSelect) {
      ifaceSelect.value = '';
      ifaceSelect.disabled = false;
    }
    if (distInput) distInput.value = 1;
    if (commentInput) commentInput.value = '';
    if (defRouteCheck) defRouteCheck.checked = true;
    if (peerDnsCheck) peerDnsCheck.checked = true;
    if (peerNtpCheck) peerNtpCheck.checked = true;
    if (enabledCheck) enabledCheck.checked = true;
  }

  modal.classList.remove('hidden');
}

function openDHCPClientModalForIface(ifaceName) {
  openDHCPClientModal();
  const ifaceSelect = document.getElementById('modal-dhcp-iface');
  if (ifaceSelect && ifaceName) {
    ifaceSelect.value = ifaceName;
  }
}

function closeDHCPClientModal() {
  const modal = document.getElementById('modal-dhcp-client');
  if (modal) modal.classList.add('hidden');
}

async function submitSaveDHCPClient(e) {
  if (e) e.preventDefault();

  const id = document.getElementById('modal-dhcp-id')?.value;
  const iface = document.getElementById('modal-dhcp-iface')?.value?.trim();
  const distance = parseInt(document.getElementById('modal-dhcp-distance')?.value || '1', 10);
  const comment = document.getElementById('modal-dhcp-comment')?.value?.trim() || '';
  const defRoute = document.getElementById('modal-dhcp-def-route')?.checked ?? true;
  const peerDns = document.getElementById('modal-dhcp-peer-dns')?.checked ?? true;
  const peerNtp = document.getElementById('modal-dhcp-peer-ntp')?.checked ?? true;
  const enabled = document.getElementById('modal-dhcp-enabled')?.checked ?? true;

  if (!id && !iface) {
    showToast('Input Required', 'Please select an interface for the DHCP client', 'warning');
    return;
  }

  try {
    let res;
    if (id) {
      // PUT update
      res = await fetch(`${API_BASE}/dhcp/clients/${id}`, {
        method: 'PUT',
        headers: { 'Content-Type': 'application/json' },
        body: JSON.stringify({
          enabled,
          add_default_route: defRoute,
          default_route_distance: distance,
          use_peer_dns: peerDns,
          use_peer_ntp: peerNtp,
          comment
        })
      });
    } else {
      // POST create
      res = await fetch(`${API_BASE}/dhcp/clients`, {
        method: 'POST',
        headers: { 'Content-Type': 'application/json' },
        body: JSON.stringify({
          interface: iface,
          enabled,
          add_default_route: defRoute,
          default_route_distance: distance,
          use_peer_dns: peerDns,
          use_peer_ntp: peerNtp,
          comment
        })
      });
    }

    const data = await res.json();
    if (!res.ok) {
      showToast('Error', data.error || 'Failed to save DHCP client', 'error');
      return;
    }

    closeDHCPClientModal();
    showToast('Success', id ? 'DHCP Client updated successfully' : `DHCP Client activated on ${iface}`, 'success');
    await loadDHCPClients();
    fetchData(); // refresh interfaces list with new lease/status
  } catch (err) {
    showToast('Error', err.message, 'error');
  }
}

async function toggleDHCPClientState(id, enabled) {
  try {
    const res = await fetch(`${API_BASE}/dhcp/clients/${id}/state`, {
      method: 'POST',
      headers: { 'Content-Type': 'application/json' },
      body: JSON.stringify({ enabled })
    });
    const data = await res.json();
    if (!res.ok) {
      showToast('Error', data.error || 'Failed to toggle client state', 'error');
      return;
    }
    showToast('Updated', `DHCP client ${enabled ? 'enabled' : 'disabled'}`, 'info');
    await loadDHCPClients();
    fetchData();
  } catch (err) {
    showToast('Error', err.message, 'error');
  }
}

async function renewDHCPClient(id) {
  try {
    showToast('Renewing...', 'Requesting DHCP lease renewal from upstream server', 'info');
    const res = await fetch(`${API_BASE}/dhcp/clients/${id}/renew`, {
      method: 'POST'
    });
    const data = await res.json();
    if (!res.ok) {
      showToast('Error', data.error || 'Failed to renew lease', 'error');
      return;
    }
    showToast('Lease Renewed', 'DHCP renewal signal sent successfully', 'success');
    setTimeout(() => {
      loadDHCPClients();
      fetchData();
    }, 1500);
  } catch (err) {
    showToast('Error', err.message, 'error');
  }
}

async function releaseDHCPClient(id) {
  try {
    const res = await fetch(`${API_BASE}/dhcp/clients/${id}/release`, {
      method: 'POST'
    });
    const data = await res.json();
    if (!res.ok) {
      showToast('Error', data.error || 'Failed to release lease', 'error');
      return;
    }
    showToast('Lease Released', 'DHCP lease released from upstream server', 'info');
    await loadDHCPClients();
    fetchData();
  } catch (err) {
    showToast('Error', err.message, 'error');
  }
}

async function deleteDHCPClient(id, ifaceName) {
  if (!confirm(`Are you sure you want to remove the DHCP Client on ${ifaceName}? The interface will release its dynamic IP.`)) {
    return;
  }
  try {
    const res = await fetch(`${API_BASE}/dhcp/clients/${id}`, {
      method: 'DELETE'
    });
    const data = await res.json();
    if (!res.ok) {
      showToast('Error', data.error || 'Failed to delete DHCP client', 'error');
      return;
    }
    showToast('Deleted', `DHCP client removed from ${ifaceName}`, 'info');
    await loadDHCPClients();
    fetchData();
  } catch (err) {
    showToast('Error', err.message, 'error');
  }
}

// ==================== DHCP SERVER (/ip dhcp-server) ====================

async function loadDHCPServer(populate = true) {
  try {
    const [sumRes, srvRes, netRes, leaseRes, optRes] = await Promise.all([
      fetch(`${API_BASE}/dhcp-server/summary`),
      fetch(`${API_BASE}/dhcp-server/servers`),
      fetch(`${API_BASE}/dhcp-server/networks`),
      fetch(`${API_BASE}/dhcp-server/leases`),
      fetch(`${API_BASE}/dhcp-server/options`)
    ]);

    if (sumRes.ok) state.dhcpServerSummary = await sumRes.json();
    if (srvRes.ok) state.dhcpServers = await srvRes.json();
    if (netRes.ok) state.dhcpNetworks = await netRes.json();
    if (leaseRes.ok) state.dhcpLeases = await leaseRes.json();
    if (optRes.ok) state.dhcpOptions = await optRes.json();

    const sum = state.dhcpServerSummary || {};
    const srvs = state.dhcpServers || [];
    const nets = state.dhcpNetworks || [];
    const leases = state.dhcpLeases || [];
    const opts = state.dhcpOptions || [];

    // KPI Cards
    const statActive = document.getElementById('dhcp-server-stat-active');
    if (statActive) {
      const activeCount = srvs.filter(s => s.running).length;
      statActive.innerText = `${activeCount} / ${srvs.length}`;
    }

    const statLeases = document.getElementById('dhcp-server-stat-leases');
    if (statLeases) {
      statLeases.innerText = leases.length;
    }

    const statLeasesSub = document.getElementById('dhcp-server-stat-leases-sub');
    if (statLeasesSub) {
      const dyn = leases.filter(l => l.dynamic).length;
      const st = leases.filter(l => !l.dynamic).length;
      statLeasesSub.innerText = `${dyn} dynamic, ${st} static`;
    }

    const statNetworks = document.getElementById('dhcp-server-stat-networks');
    if (statNetworks) {
      statNetworks.innerText = nets.length;
    }

    // Subtab Badges
    const bSrv = document.getElementById('dhcp-server-tab-badge-servers');
    if (bSrv) bSrv.innerText = srvs.length;
    const bNet = document.getElementById('dhcp-server-tab-badge-networks');
    if (bNet) bNet.innerText = nets.length;
    const bLease = document.getElementById('dhcp-server-tab-badge-leases');
    if (bLease) bLease.innerText = leases.length;
    const bOpt = document.getElementById('dhcp-server-tab-badge-options');
    if (bOpt) bOpt.innerText = opts.length;

    // Sidebar Badge
    const sideBadge = document.getElementById('badge-dhcp-server-count');
    if (sideBadge) sideBadge.innerText = leases.length || srvs.length;

    renderCurrentDHCPServerTab();
  } catch (err) {
    console.error('Failed to load DHCP Server:', err);
  }
}

function switchDHCPServerTab(tab) {
  state.dhcpServerTab = tab;
  const tabs = ['servers', 'networks', 'leases', 'options'];
  tabs.forEach(t => {
    const panel = document.getElementById(`dhcp-server-subtab-${t}`);
    const btn = document.getElementById(`dhcp-server-tab-btn-${t}`);
    if (panel) {
      if (t === tab) panel.classList.remove('hidden');
      else panel.classList.add('hidden');
    }
    if (btn) {
      if (t === tab) {
        btn.className = 'px-4 py-2.5 text-xs font-bold border-b-2 border-emerald-500 text-white transition flex items-center gap-2 whitespace-nowrap';
      } else {
        btn.className = 'px-4 py-2.5 text-xs font-bold border-b-2 border-transparent text-slate-400 hover:text-slate-200 transition flex items-center gap-2 whitespace-nowrap';
      }
    }
  });

  const addBtn = document.getElementById('dhcp-server-primary-add-btn');
  if (addBtn) {
    if (tab === 'servers') addBtn.innerHTML = '<span>+ Add Server</span>';
    else if (tab === 'networks') addBtn.innerHTML = '<span>+ Add Network</span>';
    else if (tab === 'leases') addBtn.innerHTML = '<span>+ Add Static Lease</span>';
    else if (tab === 'options') addBtn.innerHTML = '<span>+ Add Option</span>';
  }

  renderCurrentDHCPServerTab();
}

function handleDHCPServerPrimaryAdd() {
  const tab = state.dhcpServerTab || 'servers';
  if (tab === 'servers') openAddDHCPServerModal();
  else if (tab === 'networks') openAddDHCPNetworkModal();
  else if (tab === 'leases') openAddDHCPStaticLeaseModal();
  else if (tab === 'options') openAddDHCPOptionModal();
}

function renderCurrentDHCPServerTab() {
  const tab = state.dhcpServerTab || 'servers';
  if (tab === 'servers') renderDHCPServers();
  else if (tab === 'networks') renderDHCPNetworks();
  else if (tab === 'leases') renderDHCPLeases();
  else if (tab === 'options') renderDHCPOptions();
}

function renderDHCPServers() {
  const tbody = document.getElementById('dhcp-server-tbody');
  const empty = document.getElementById('dhcp-server-empty');
  if (!tbody) return;

  const servers = state.dhcpServers || [];
  if (servers.length === 0) {
    tbody.innerHTML = '';
    empty?.classList.remove('hidden');
    return;
  }
  empty?.classList.add('hidden');

  const sig = servers.map(s => `${s.id}:${s.running}:${s.disabled}:${s.active_leases}:${s.interface}`).join(';');
  if (tbody.dataset.sig === sig) return;
  tbody.dataset.sig = sig;
  tbody.innerHTML = '';

  servers.forEach(s => {
    const tr = document.createElement('tr');
    tr.className = `hover:bg-slate-800/40 transition text-xs ${s.disabled ? 'opacity-50' : ''}`;
    tr.innerHTML = `
      <td class="py-2.5 px-3 text-center">${renderMikroTikFlag(s.running, s.disabled)}</td>
      <td class="py-2.5 px-3 font-bold text-white font-mono">${escapeHtml(s.name)}</td>
      <td class="py-2.5 px-3 font-mono text-cyan-400 font-semibold">${escapeHtml(s.interface)}</td>
      <td class="py-2.5 px-3 font-mono font-semibold">${s.network ? `<span class="px-2 py-0.5 rounded text-[11px] bg-emerald-500/10 text-emerald-300 border border-emerald-500/20 font-bold">${escapeHtml(s.network)}</span>` : '<span class="text-slate-500 italic text-[11px]">Unassigned</span>'}</td>
      <td class="py-2.5 px-3 font-mono text-emerald-400">${escapeHtml(s.address_pool)}</td>
      <td class="py-2.5 px-3 font-mono text-slate-300">${escapeHtml(s.lease_time || '12h')}</td>
      <td class="py-2.5 px-3 font-mono text-slate-300">${s.authoritative ? '<span class="text-emerald-400 font-bold">yes</span>' : '<span class="text-slate-500">no</span>'}</td>
      <td class="py-2.5 px-3 font-mono text-cyan-300"><span class="px-1.5 py-0.5 rounded text-[10px] bg-slate-800 border border-slate-700">${s.active_leases || 0}</span></td>
      <td class="py-2.5 px-3 text-slate-400 italic truncate max-w-[140px]" title="${escapeHtml(s.comment || '')}">${escapeHtml(s.comment || '-')}</td>
      <td class="py-2.5 px-3 text-right space-x-1.5 font-sans whitespace-nowrap">
        <button onclick="toggleDHCPServerState('${s.id}', ${!s.disabled})" class="text-xs ${s.disabled ? 'text-emerald-400' : 'text-slate-400'} hover:underline">${s.disabled ? 'Enable' : 'Disable'}</button>
        <button onclick="openEditDHCPServerModal('${s.id}')" class="text-xs text-slate-400 hover:text-white">Edit</button>
        <button onclick="deleteDHCPServer('${s.id}', '${escapeHtml(s.name)}')" class="text-xs text-rose-400 hover:text-rose-300">Delete</button>
      </td>
    `;
    tbody.appendChild(tr);
  });
}

function renderDHCPNetworks() {
  const tbody = document.getElementById('dhcp-networks-tbody');
  const empty = document.getElementById('dhcp-networks-empty');
  if (!tbody) return;
  tbody.innerHTML = '';

  const networks = state.dhcpNetworks || [];
  if (networks.length === 0) {
    empty?.classList.remove('hidden');
    return;
  }
  empty?.classList.add('hidden');

  networks.forEach(n => {
    const tr = document.createElement('tr');
    tr.className = 'hover:bg-slate-800/40 transition text-xs';

    const dnsStr = (n.dns_servers || []).join(', ') || '-';
    const optionsChips = (n.dhcp_options || []).map(optId => {
      const opt = (state.dhcpOptions || []).find(o => o.id === optId);
      if (!opt) return '';
      return `<span class="px-1.5 py-0.5 rounded text-[10px] bg-slate-800 text-cyan-300 border border-slate-700 inline-block mr-1 mb-0.5" title="${escapeHtml(opt.name)}: ${escapeHtml(opt.value)}">#${opt.code} ${escapeHtml(opt.name)}</span>`;
    }).filter(Boolean).join('');

    tr.innerHTML = `
      <td class="py-2.5 px-3 font-bold text-emerald-400 font-mono">${escapeHtml(n.address)}</td>
      <td class="py-2.5 px-3 font-mono text-cyan-300 font-semibold">${escapeHtml(n.gateway || '-')}</td>
      <td class="py-2.5 px-3 font-mono text-slate-300">${escapeHtml(n.netmask || '-')}</td>
      <td class="py-2.5 px-3 font-mono text-slate-300 truncate max-w-[140px]" title="${escapeHtml(dnsStr)}">${escapeHtml(dnsStr)}</td>
      <td class="py-2.5 px-3 font-mono text-slate-400">${escapeHtml(n.domain || '-')}</td>
      <td class="py-2.5 px-3 font-mono">${optionsChips || '<span class="text-slate-600 font-sans">-</span>'}</td>
      <td class="py-2.5 px-3 text-slate-400 italic truncate max-w-[120px]" title="${escapeHtml(n.comment || '')}">${escapeHtml(n.comment || '-')}</td>
      <td class="py-2.5 px-3 text-right space-x-1.5 font-sans whitespace-nowrap">
        <button onclick="openEditDHCPNetworkModal('${n.id}')" class="text-xs text-slate-400 hover:text-white">Edit</button>
        <button onclick="deleteDHCPNetwork('${n.id}', '${escapeHtml(n.address)}')" class="text-xs text-rose-400 hover:text-rose-300">Delete</button>
      </td>
    `;
    tbody.appendChild(tr);
  });
}

function renderDHCPLeases() {
  const tbody = document.getElementById('dhcp-leases-tbody');
  const empty = document.getElementById('dhcp-leases-empty');
  if (!tbody) return;
  tbody.innerHTML = '';

  const leases = state.dhcpLeases || [];
  if (leases.length === 0) {
    empty?.classList.remove('hidden');
    return;
  }
  empty?.classList.add('hidden');

  leases.forEach(l => {
    const tr = document.createElement('tr');
    tr.className = `hover:bg-slate-800/40 transition text-xs ${l.disabled ? 'opacity-50' : ''}`;

    const flag = l.dynamic ? '<span class="text-sky-400 font-bold" title="Dynamic">D</span>' : '<span class="text-purple-400 font-bold" title="Static Reservation">S</span>';
    const statusBadge = l.status === 'bound'
      ? '<span class="px-1.5 py-0.5 rounded text-[10px] bg-emerald-500/20 text-emerald-300 border border-emerald-500/30 font-semibold font-mono">bound</span>'
      : l.status === 'static'
      ? '<span class="px-1.5 py-0.5 rounded text-[10px] bg-purple-500/20 text-purple-300 border border-purple-500/30 font-semibold font-mono">static</span>'
      : '<span class="px-1.5 py-0.5 rounded text-[10px] bg-slate-800 text-slate-400 border border-slate-700 font-mono">waiting</span>';

    const makeStaticBtn = l.dynamic
      ? `<button onclick="makeDHCPLeaseStatic('${escapeHtml(l.mac_address)}', '${escapeHtml(l.address)}', '${escapeHtml(l.hostname || '')}', '${escapeHtml(l.comment || '')}')" class="text-xs px-2 py-0.5 rounded bg-purple-500/20 text-purple-300 border border-purple-500/30 hover:bg-purple-500/30 font-medium">Make Static</button>`
      : `<button onclick="deleteDHCPStaticLease('${l.id}')" class="text-xs text-rose-400 hover:text-rose-300 font-medium">Remove</button>`;

    tr.innerHTML = `
      <td class="py-2.5 px-3 text-center">${flag}</td>
      <td class="py-2.5 px-3 font-bold text-white font-mono">${escapeHtml(l.address)}</td>
      <td class="py-2.5 px-3 font-mono text-cyan-300">${escapeHtml(l.mac_address)}</td>
      <td class="py-2.5 px-3 font-sans text-slate-200 font-medium">${escapeHtml(l.hostname || '*')}</td>
      <td class="py-2.5 px-3 font-mono text-slate-400">${escapeHtml(l.server || 'all')}</td>
      <td class="py-2.5 px-3 font-mono text-slate-300">${escapeHtml(l.expires_in || 'never')}</td>
      <td class="py-2.5 px-3">${statusBadge}</td>
      <td class="py-2.5 px-3 text-slate-400 italic truncate max-w-[120px]" title="${escapeHtml(l.comment || '')}">${escapeHtml(l.comment || '-')}</td>
      <td class="py-2.5 px-3 text-right space-x-1.5 font-sans whitespace-nowrap">
        ${makeStaticBtn}
      </td>
    `;
    tbody.appendChild(tr);
  });
}

function renderDHCPOptions() {
  const tbody = document.getElementById('dhcp-options-tbody');
  const empty = document.getElementById('dhcp-options-empty');
  if (!tbody) return;
  tbody.innerHTML = '';

  const options = state.dhcpOptions || [];
  if (options.length === 0) {
    empty?.classList.remove('hidden');
    return;
  }
  empty?.classList.add('hidden');

  options.forEach(o => {
    const tr = document.createElement('tr');
    tr.className = 'hover:bg-slate-800/40 transition text-xs';
    tr.innerHTML = `
      <td class="py-2.5 px-3 font-bold text-white font-mono">${escapeHtml(o.name)}</td>
      <td class="py-2.5 px-3 font-bold text-cyan-400 font-mono">${o.code}</td>
      <td class="py-2.5 px-3 font-mono text-emerald-400 break-all max-w-xs">${escapeHtml(o.value)}</td>
      <td class="py-2.5 px-3 text-slate-400 italic truncate max-w-xs" title="${escapeHtml(o.comment || '')}">${escapeHtml(o.comment || '-')}</td>
      <td class="py-2.5 px-3 text-right space-x-1.5 font-sans whitespace-nowrap">
        <button onclick="openEditDHCPOptionModal('${o.id}')" class="text-xs text-slate-400 hover:text-white">Edit</button>
        <button onclick="deleteDHCPOption('${o.id}', '${escapeHtml(o.name)}')" class="text-xs text-rose-400 hover:text-rose-300">Delete</button>
      </td>
    `;
    tbody.appendChild(tr);
  });
}

// ==================== MODALS & ACTIONS: SERVER ====================
function populateDHCPNetworkSelect(elemId, selectedVal) {
  const sel = document.getElementById(elemId);
  if (!sel) return;
  sel.innerHTML = '<option value="">Select network subnet...</option>';
  const networks = state.dhcpNetworks || [];
  networks.forEach(n => {
    const opt = document.createElement('option');
    opt.value = n.address;
    opt.innerText = `${n.address} (Gateway: ${n.gateway || 'None'}${n.comment ? ' - ' + n.comment : ''})`;
    if (selectedVal && (selectedVal === n.address || selectedVal === n.id)) {
      opt.selected = true;
    }
    sel.appendChild(opt);
  });
}

function onDHCPServerNetworkChange() {
  const netSel = document.getElementById('dhcp-server-modal-network');
  if (!netSel) return;
  const netVal = netSel.value;
  if (!netVal) return;
  const poolInput = document.getElementById('dhcp-server-modal-pool');
  if (!poolInput) return;

  // Auto-calculate suggested address pool based on subnet CIDR
  const parts = netVal.split('/');
  const ip = parts[0];
  const cidr = parseInt(parts[1] || '24', 10);
  if (cidr === 24) {
    const octets = ip.split('.');
    if (octets.length === 4) {
      const base = `${octets[0]}.${octets[1]}.${octets[2]}`;
      poolInput.value = `${base}.10-${base}.254`;
    }
  }
}

function openAddDHCPServerModal() {
  document.getElementById('dhcp-server-modal-title').innerText = 'Add DHCP Server';
  document.getElementById('dhcp-server-modal-id').value = '';
  document.getElementById('dhcp-server-modal-name').value = `dhcp${(state.dhcpServers || []).length + 1}`;
  document.getElementById('dhcp-server-modal-pool').value = '192.168.88.10-192.168.88.254';
  document.getElementById('dhcp-server-modal-leasetime').value = '12h';
  document.getElementById('dhcp-server-modal-comment').value = '';
  document.getElementById('dhcp-server-modal-authoritative').checked = true;
  document.getElementById('dhcp-server-modal-disabled').checked = false;

  populateDHCPIfaceSelect('dhcp-server-modal-iface', '');
  
  const networks = state.dhcpNetworks || [];
  const defaultNet = networks.length > 0 ? networks[0].address : '';
  populateDHCPNetworkSelect('dhcp-server-modal-network', defaultNet);
  if (defaultNet) {
    onDHCPServerNetworkChange();
  }

  document.getElementById('dhcp-server-instance-modal').classList.remove('hidden');
}

function openEditDHCPServerModal(id) {
  const s = (state.dhcpServers || []).find(item => item.id === id);
  if (!s) return;
  document.getElementById('dhcp-server-modal-title').innerText = `Edit DHCP Server (${s.name})`;
  document.getElementById('dhcp-server-modal-id').value = s.id;
  document.getElementById('dhcp-server-modal-name').value = s.name;
  document.getElementById('dhcp-server-modal-pool').value = s.address_pool;
  document.getElementById('dhcp-server-modal-leasetime').value = s.lease_time || '12h';
  document.getElementById('dhcp-server-modal-comment').value = s.comment || '';
  document.getElementById('dhcp-server-modal-authoritative').checked = s.authoritative !== false;
  document.getElementById('dhcp-server-modal-disabled').checked = !!s.disabled;

  populateDHCPIfaceSelect('dhcp-server-modal-iface', s.interface);
  populateDHCPNetworkSelect('dhcp-server-modal-network', s.network || '');
  document.getElementById('dhcp-server-instance-modal').classList.remove('hidden');
}

function closeDHCPServerModal() {
  document.getElementById('dhcp-server-instance-modal').classList.add('hidden');
}

async function submitSaveDHCPServer(e) {
  e.preventDefault();
  const id = document.getElementById('dhcp-server-modal-id').value;
  const name = document.getElementById('dhcp-server-modal-name').value.trim();
  const iface = document.getElementById('dhcp-server-modal-iface').value;
  const network = document.getElementById('dhcp-server-modal-network').value.trim();
  const pool = document.getElementById('dhcp-server-modal-pool').value.trim();
  const leaseTime = document.getElementById('dhcp-server-modal-leasetime').value.trim() || '12h';
  const comment = document.getElementById('dhcp-server-modal-comment').value.trim();
  const authoritative = document.getElementById('dhcp-server-modal-authoritative').checked;
  const disabled = document.getElementById('dhcp-server-modal-disabled').checked;

  try {
    const res = await fetch(`${API_BASE}/dhcp-server/servers`, {
      method: 'POST',
      headers: { 'Content-Type': 'application/json' },
      body: JSON.stringify({
        id,
        name,
        interface: iface,
        network,
        address_pool: pool,
        lease_time: leaseTime,
        authoritative,
        disabled,
        comment
      })
    });
    if (res.ok) {
      showToast('DHCP Server Saved', `Server ${name} configured successfully`, 'success');
      closeDHCPServerModal();
      loadDHCPServer(false);
      fetchData(false);
    } else {
      const err = await res.text();
      showToast('Error', err, 'error');
    }
  } catch (err) {
    showToast('Error', err.message, 'error');
  }
}

async function toggleDHCPServerState(id, disabled) {
  try {
    const res = await fetch(`${API_BASE}/dhcp-server/servers/${encodeURIComponent(id)}/state`, {
      method: 'POST',
      headers: { 'Content-Type': 'application/json' },
      body: JSON.stringify({ disabled })
    });
    if (res.ok) {
      showToast('State Updated', disabled ? 'Server disabled' : 'Server enabled', 'info');
      loadDHCPServer(false);
      fetchData(false);
    }
  } catch (err) {
    showToast('Error', err.message, 'error');
  }
}

async function deleteDHCPServer(id, name) {
  if (!confirm(`Are you sure you want to delete DHCP Server "${name}"?`)) return;
  try {
    const res = await fetch(`${API_BASE}/dhcp-server/servers/${encodeURIComponent(id)}`, { method: 'DELETE' });
    if (res.ok) {
      showToast('Deleted', `DHCP Server ${name} removed`, 'success');
      loadDHCPServer(false);
      fetchData(false);
    }
  } catch (err) {
    showToast('Error', err.message, 'error');
  }
}

// ==================== MODALS & ACTIONS: NETWORKS ====================
function openAddDHCPNetworkModal() {
  document.getElementById('dhcp-network-modal-title').innerText = 'Add DHCP Network';
  document.getElementById('dhcp-network-modal-id').value = '';
  document.getElementById('dhcp-network-modal-address').value = '192.168.88.0/24';
  document.getElementById('dhcp-network-modal-gateway').value = '192.168.88.1';
  document.getElementById('dhcp-network-modal-dns').value = '192.168.88.1, 1.1.1.1, 8.8.8.8';
  document.getElementById('dhcp-network-modal-domain').value = 'lan';
  document.getElementById('dhcp-network-modal-netmask').value = '';
  document.getElementById('dhcp-network-modal-comment').value = '';

  renderDHCPNetworkOptionsCheckboxes([]);
  document.getElementById('dhcp-network-modal').classList.remove('hidden');
}

function openEditDHCPNetworkModal(id) {
  const n = (state.dhcpNetworks || []).find(item => item.id === id);
  if (!n) return;

  document.getElementById('dhcp-network-modal-title').innerText = `Edit DHCP Network (${n.address})`;
  document.getElementById('dhcp-network-modal-id').value = n.id;
  document.getElementById('dhcp-network-modal-address').value = n.address;
  document.getElementById('dhcp-network-modal-gateway').value = n.gateway || '';
  document.getElementById('dhcp-network-modal-dns').value = (n.dns_servers || []).join(', ');
  document.getElementById('dhcp-network-modal-domain').value = n.domain || '';
  document.getElementById('dhcp-network-modal-netmask').value = n.netmask || '';
  document.getElementById('dhcp-network-modal-comment').value = n.comment || '';

  renderDHCPNetworkOptionsCheckboxes(n.dhcp_options || []);
  document.getElementById('dhcp-network-modal').classList.remove('hidden');
}

function renderDHCPNetworkOptionsCheckboxes(selectedIds) {
  const container = document.getElementById('dhcp-network-modal-options-list');
  if (!container) return;
  container.innerHTML = '';

  const opts = state.dhcpOptions || [];
  if (opts.length === 0) {
    container.innerHTML = '<span class="text-slate-500 text-[11px] col-span-2">No custom options configured. Add some in the "Options" tab.</span>';
    return;
  }

  opts.forEach(o => {
    const isChecked = selectedIds.includes(o.id);
    const label = document.createElement('label');
    label.className = 'flex items-center space-x-2 text-slate-300 hover:text-white cursor-pointer';
    label.innerHTML = `
      <input type="checkbox" name="dhcp-net-opt" value="${o.id}" ${isChecked ? 'checked' : ''} class="rounded bg-slate-800 border-slate-700 text-emerald-600">
      <span class="truncate" title="${escapeHtml(o.name)} (Code ${o.code})">${escapeHtml(o.name)} <span class="text-cyan-400">#${o.code}</span></span>
    `;
    container.appendChild(label);
  });
}

function closeDHCPNetworkModal() {
  document.getElementById('dhcp-network-modal').classList.add('hidden');
}

async function submitSaveDHCPNetwork(e) {
  e.preventDefault();
  const id = document.getElementById('dhcp-network-modal-id').value;
  const address = document.getElementById('dhcp-network-modal-address').value.trim();
  const gateway = document.getElementById('dhcp-network-modal-gateway').value.trim();
  const dnsStr = document.getElementById('dhcp-network-modal-dns').value.trim();
  const domain = document.getElementById('dhcp-network-modal-domain').value.trim();
  const netmask = document.getElementById('dhcp-network-modal-netmask').value.trim();
  const comment = document.getElementById('dhcp-network-modal-comment').value.trim();

  const selectedOpts = [];
  document.querySelectorAll('input[name="dhcp-net-opt"]:checked').forEach(cb => selectedOpts.push(cb.value));

  const dnsServers = dnsStr ? dnsStr.split(',').map(s => s.trim()).filter(Boolean) : [];

  try {
    const res = await fetch(`${API_BASE}/dhcp-server/networks`, {
      method: 'POST',
      headers: { 'Content-Type': 'application/json' },
      body: JSON.stringify({
        id,
        address,
        gateway,
        netmask,
        dns_servers: dnsServers,
        domain,
        dhcp_options: selectedOpts,
        comment
      })
    });
    if (res.ok) {
      showToast('Network Saved', `Subnet ${address} configured successfully`, 'success');
      closeDHCPNetworkModal();
      loadDHCPServer(false);
      fetchData(false);
    } else {
      const err = await res.text();
      showToast('Error', err, 'error');
    }
  } catch (err) {
    showToast('Error', err.message, 'error');
  }
}

async function deleteDHCPNetwork(id, addr) {
  if (!confirm(`Are you sure you want to delete DHCP Network "${addr}"?`)) return;
  try {
    const res = await fetch(`${API_BASE}/dhcp-server/networks/${encodeURIComponent(id)}`, { method: 'DELETE' });
    if (res.ok) {
      showToast('Deleted', `Network ${addr} removed`, 'success');
      loadDHCPServer(false);
      fetchData(false);
    }
  } catch (err) {
    showToast('Error', err.message, 'error');
  }
}

// ==================== MODALS & ACTIONS: LEASES ====================
function openAddDHCPStaticLeaseModal() {
  document.getElementById('dhcp-static-lease-modal-title').innerText = 'Add Static Lease Reservation';
  document.getElementById('dhcp-static-lease-modal-id').value = '';
  document.getElementById('dhcp-static-lease-modal-mac').value = '';
  document.getElementById('dhcp-static-lease-modal-ip').value = '';
  document.getElementById('dhcp-static-lease-modal-hostname').value = '';
  document.getElementById('dhcp-static-lease-modal-server').value = 'all';
  document.getElementById('dhcp-static-lease-modal-comment').value = '';
  document.getElementById('dhcp-static-lease-modal-disabled').checked = false;
  document.getElementById('dhcp-static-lease-modal').classList.remove('hidden');
}

function closeDHCPStaticLeaseModal() {
  document.getElementById('dhcp-static-lease-modal').classList.add('hidden');
}

async function submitSaveDHCPStaticLease(e) {
  e.preventDefault();
  const id = document.getElementById('dhcp-static-lease-modal-id').value;
  const mac = document.getElementById('dhcp-static-lease-modal-mac').value.trim();
  const ip = document.getElementById('dhcp-static-lease-modal-ip').value.trim();
  const hostname = document.getElementById('dhcp-static-lease-modal-hostname').value.trim();
  const server = document.getElementById('dhcp-static-lease-modal-server').value.trim() || 'all';
  const comment = document.getElementById('dhcp-static-lease-modal-comment').value.trim();
  const disabled = document.getElementById('dhcp-static-lease-modal-disabled').checked;

  try {
    const res = await fetch(`${API_BASE}/dhcp-server/leases/static`, {
      method: 'POST',
      headers: { 'Content-Type': 'application/json' },
      body: JSON.stringify({
        id,
        mac_address: mac,
        address: ip,
        hostname,
        server,
        comment,
        disabled
      })
    });
    if (res.ok) {
      showToast('Static Lease Saved', `IP ${ip} reserved for ${mac}`, 'success');
      closeDHCPStaticLeaseModal();
      loadDHCPServer(false);
      fetchData(false);
    } else {
      const err = await res.text();
      showToast('Error', err, 'error');
    }
  } catch (err) {
    showToast('Error', err.message, 'error');
  }
}

async function deleteDHCPStaticLease(id) {
  if (!confirm('Are you sure you want to remove this static reservation?')) return;
  try {
    const res = await fetch(`${API_BASE}/dhcp-server/leases/${encodeURIComponent(id)}`, { method: 'DELETE' });
    if (res.ok) {
      showToast('Deleted', 'Static lease removed', 'success');
      loadDHCPServer(false);
      fetchData(false);
    }
  } catch (err) {
    showToast('Error', err.message, 'error');
  }
}

async function makeDHCPLeaseStatic(mac, ip, hostname, comment) {
  try {
    const res = await fetch(`${API_BASE}/dhcp-server/leases/make-static`, {
      method: 'POST',
      headers: { 'Content-Type': 'application/json' },
      body: JSON.stringify({
        mac_address: mac,
        address: ip,
        hostname,
        comment: comment || 'Converted to static'
      })
    });
    if (res.ok) {
      showToast('Lease Made Static', `IP ${ip} permanently reserved for ${mac}`, 'success');
      loadDHCPServer(false);
      fetchData(false);
    } else {
      const err = await res.text();
      showToast('Error', err, 'error');
    }
  } catch (err) {
    showToast('Error', err.message, 'error');
  }
}

// ==================== MODALS & ACTIONS: OPTIONS ====================
function openAddDHCPOptionModal() {
  document.getElementById('dhcp-option-modal-title').innerText = 'Add DHCP Option';
  document.getElementById('dhcp-option-modal-id').value = '';
  document.getElementById('dhcp-option-modal-name').value = '';
  document.getElementById('dhcp-option-modal-code').value = '';
  document.getElementById('dhcp-option-modal-value').value = '';
  document.getElementById('dhcp-option-modal-comment').value = '';
  document.getElementById('dhcp-option-modal').classList.remove('hidden');
}

function openEditDHCPOptionModal(id) {
  const o = (state.dhcpOptions || []).find(item => item.id === id);
  if (!o) return;
  document.getElementById('dhcp-option-modal-title').innerText = `Edit DHCP Option (${o.name})`;
  document.getElementById('dhcp-option-modal-id').value = o.id;
  document.getElementById('dhcp-option-modal-name').value = o.name;
  document.getElementById('dhcp-option-modal-code').value = o.code;
  document.getElementById('dhcp-option-modal-value').value = o.value;
  document.getElementById('dhcp-option-modal-comment').value = o.comment || '';
  document.getElementById('dhcp-option-modal').classList.remove('hidden');
}

function closeDHCPOptionModal() {
  document.getElementById('dhcp-option-modal').classList.add('hidden');
}

async function submitSaveDHCPOption(e) {
  e.preventDefault();
  const id = document.getElementById('dhcp-option-modal-id').value;
  const name = document.getElementById('dhcp-option-modal-name').value.trim();
  const code = parseInt(document.getElementById('dhcp-option-modal-code').value);
  const value = document.getElementById('dhcp-option-modal-value').value.trim();
  const comment = document.getElementById('dhcp-option-modal-comment').value.trim();

  try {
    const res = await fetch(`${API_BASE}/dhcp-server/options`, {
      method: 'POST',
      headers: { 'Content-Type': 'application/json' },
      body: JSON.stringify({ id, name, code, value, comment })
    });
    if (res.ok) {
      showToast('Option Saved', `DHCP option ${name} (#${code}) configured`, 'success');
      closeDHCPOptionModal();
      loadDHCPServer(false);
      fetchData(false);
    } else {
      const err = await res.text();
      showToast('Error', err, 'error');
    }
  } catch (err) {
    showToast('Error', err.message, 'error');
  }
}

async function deleteDHCPOption(id, name) {
  if (!confirm(`Are you sure you want to delete DHCP Option "${name}"?`)) return;
  try {
    const res = await fetch(`${API_BASE}/dhcp-server/options/${encodeURIComponent(id)}`, { method: 'DELETE' });
    if (res.ok) {
      showToast('Deleted', `Option ${name} removed`, 'success');
      loadDHCPServer(false);
      fetchData(false);
    }
  } catch (err) {
    showToast('Error', err.message, 'error');
  }
}

// ==================== WIZARD: DHCP SETUP (MikroTik style) ====================
function openDHCPServerSetupModal() {
  populateDHCPIfaceSelect('dhcp-wizard-iface', '');
  onDHCPWizardIfaceChange();
  document.getElementById('dhcp-setup-wizard-modal').classList.remove('hidden');
}

function closeDHCPServerSetupModal() {
  document.getElementById('dhcp-setup-wizard-modal').classList.add('hidden');
}

function onDHCPWizardIfaceChange() {
  const ifaceName = document.getElementById('dhcp-wizard-iface').value;
  const iface = (state.interfaces || []).find(i => i.name === ifaceName);

  let ip = '192.168.88.1';
  let prefix = '24';
  if (iface && iface.ip_address) {
    const parts = iface.ip_address.split('/');
    ip = parts[0];
    if (parts.length > 1) prefix = parts[1];
  }

  // Calculate subnet base (e.g. 192.168.88.0/24)
  const ipParts = ip.split('.');
  if (ipParts.length === 4) {
    const baseSpace = `${ipParts[0]}.${ipParts[1]}.${ipParts[2]}.0/${prefix}`;
    const pool = `${ipParts[0]}.${ipParts[1]}.${ipParts[2]}.10-${ipParts[0]}.${ipParts[1]}.${ipParts[2]}.254`;
    document.getElementById('dhcp-wizard-space').value = baseSpace;
    document.getElementById('dhcp-wizard-gateway').value = ip;
    document.getElementById('dhcp-wizard-pool').value = pool;
    document.getElementById('dhcp-wizard-dns').value = `${ip}, 1.1.1.1, 8.8.8.8`;
    document.getElementById('dhcp-wizard-ntp').value = `${ip}`;
  }
}

async function submitDHCPServerSetupWizard(e) {
  e.preventDefault();
  const iface = document.getElementById('dhcp-wizard-iface').value;
  const space = document.getElementById('dhcp-wizard-space').value.trim();
  const gw = document.getElementById('dhcp-wizard-gateway').value.trim();
  const pool = document.getElementById('dhcp-wizard-pool').value.trim();
  const dnsStr = document.getElementById('dhcp-wizard-dns').value.trim();
  const leaseTime = document.getElementById('dhcp-wizard-leasetime').value.trim() || '12h';
  const ntpStr = document.getElementById('dhcp-wizard-ntp').value.trim();
  const tftp = document.getElementById('dhcp-wizard-tftp').value.trim();

  const dnsServers = dnsStr ? dnsStr.split(',').map(s => s.trim()).filter(Boolean) : [];
  const ntpServers = ntpStr ? ntpStr.split(',').map(s => s.trim()).filter(Boolean) : [];

  try {
    const res = await fetch(`${API_BASE}/dhcp-server/setup`, {
      method: 'POST',
      headers: { 'Content-Type': 'application/json' },
      body: JSON.stringify({
        interface: iface,
        address_space: space,
        gateway: gw,
        address_pool: pool,
        dns_servers: dnsServers,
        lease_time: leaseTime,
        ntp_servers: ntpServers,
        next_server: tftp
      })
    });
    if (res.ok) {
      showToast('DHCP Setup Complete', `DHCP Server setup finished on ${iface}`, 'success');
      closeDHCPServerSetupModal();
      loadDHCPServer(false);
      fetchData(false);
    } else {
      const err = await res.text();
      showToast('Error', err, 'error');
    }
  } catch (err) {
    showToast('Error', err.message, 'error');
  }
}

function populateDHCPIfaceSelect(elemId, selectedVal) {
  const sel = document.getElementById(elemId);
  if (!sel) return;
  sel.innerHTML = '<option value="">Select interface...</option>';

  const ifaces = state.interfaces || [];
  ifaces.forEach(i => {
    if (i.name === 'lo') return;
    const opt = document.createElement('option');
    opt.value = i.name;
    const ipStr = i.ip_address ? ` (${i.ip_address})` : '';
    opt.textContent = `${i.name}${ipStr} [${i.role || i.type || 'interface'}]`;
    if (i.name === selectedVal) opt.selected = true;
    sel.appendChild(opt);
  });
}

// ==================== UNIVERSAL TABLE ORDERING / SORTING (WINBOX / WEBFIG STYLE) ====================

function initTableSorting() {
  document.querySelectorAll('table').forEach(setupSortableTable);
}

function setupSortableTable(table) {
  const thead = table.querySelector('thead');
  const tbody = table.querySelector('tbody');
  if (!thead || !tbody) return;

  const headerRows = thead.querySelectorAll('tr');
  if (headerRows.length === 0) return;
  const ths = headerRows[headerRows.length - 1].querySelectorAll('th');

  ths.forEach((th, colIdx) => {
    if (th._sortBound) return;
    th._sortBound = true;

    const rawText = th.innerText.trim().toLowerCase();
    const isActionsCol = rawText === 'actions' || (rawText === 'action' && th.classList.contains('text-right'));
    const isCheckboxCol = !!th.querySelector('input[type="checkbox"]');
    const isExpandCol = (th.classList.contains('w-8') || th.classList.contains('w-6')) && !rawText;
    const isExplicitNoSort = th.classList.contains('no-sort') || th.getAttribute('data-sortable') === 'false';

    if (isActionsCol || isCheckboxCol || isExpandCol || isExplicitNoSort) {
      return;
    }

    th.classList.add('table-sortable', 'group');
    if (!th.title) th.title = 'Click to sort (Ascending / Descending / Default)';

    let icon = th.querySelector('.table-sort-icon');
    if (!icon) {
      icon = document.createElement('span');
      icon.className = 'table-sort-icon opacity-0 group-hover:opacity-50 text-slate-400';
      icon.innerHTML = '⇅';
      th.appendChild(icon);
    }

    th.addEventListener('click', (e) => {
      if (e.target.tagName === 'INPUT' || e.target.tagName === 'BUTTON' || e.target.closest('button, input')) return;
      handleHeaderClick(table, th, colIdx);
    });
  });

  if (!tbody._sortObserved) {
    tbody._sortObserved = true;
    let sortDebounceTimer = null;
    const observer = new MutationObserver((mutations) => {
      if (tbody._isSorting) return;
      
      const hasChildChanges = mutations.some(m => m.type === 'childList' && m.addedNodes.length > 0);
      if (!hasChildChanges) return;

      clearTimeout(sortDebounceTimer);
      sortDebounceTimer = setTimeout(() => {
        if (tbody._isSorting) return;
        if (table._activeSort && table._activeSort.dir !== 'none') {
          applyTableSort(table, table._activeSort.colIdx, table._activeSort.dir, false);
        } else {
          tagOriginalRowOrder(tbody);
        }
      }, 50);
    });
    tbody._sortObserver = observer;
    observer.observe(tbody, { childList: true });
  }

  tagOriginalRowOrder(tbody);
}

function tagOriginalRowOrder(tbody) {
  let idx = 0;
  Array.from(tbody.children).forEach(tr => {
    if (!tr.querySelector('td[colspan]')) {
      if (!tr.hasAttribute('data-orig-idx')) {
        tr.setAttribute('data-orig-idx', idx++);
      }
    }
  });
}

function handleHeaderClick(table, th, colIdx) {
  const currentSort = table._activeSort || { colIdx: -1, dir: 'none' };
  let newDir = 'asc';

  if (currentSort.colIdx === colIdx) {
    if (currentSort.dir === 'asc') newDir = 'desc';
    else if (currentSort.dir === 'desc') newDir = 'none';
    else newDir = 'asc';
  } else {
    newDir = 'asc';
  }

  table._activeSort = { colIdx, dir: newDir };
  updateHeaderIcons(table, colIdx, newDir);
  applyTableSort(table, colIdx, newDir, true);
}

function updateHeaderIcons(table, activeColIdx, dir) {
  const thead = table.querySelector('thead');
  if (!thead) return;
  const ths = thead.querySelectorAll('th');

  ths.forEach((th, idx) => {
    const icon = th.querySelector('.table-sort-icon');
    if (!icon) return;

    if (idx === activeColIdx && dir !== 'none') {
      icon.innerHTML = dir === 'asc' ? '▲' : '▼';
      icon.className = 'table-sort-icon text-cyan-400 font-bold opacity-100';
      th.classList.add('table-sorted-active');
    } else {
      icon.innerHTML = '⇅';
      icon.className = 'table-sort-icon opacity-0 group-hover:opacity-50 text-slate-400';
      th.classList.remove('table-sorted-active');
    }
  });
}

function applyTableSort(table, colIdx, dir, userInitiated) {
  const tbody = table.querySelector('tbody');
  if (!tbody || tbody.children.length <= 1) return;

  tbody._isSorting = true;
  tagOriginalRowOrder(tbody);

  // Group parent rows and any attached drawer/sub-rows
  const groups = [];
  let currentGroup = null;

  Array.from(tbody.children).forEach(tr => {
    if (tr.querySelector('td[colspan]')) {
      if (currentGroup) {
        currentGroup.subRows.push(tr);
      } else {
        groups.push({ mainRow: tr, subRows: [] });
      }
    } else {
      currentGroup = { mainRow: tr, subRows: [] };
      groups.push(currentGroup);
    }
  });

  if (dir === 'none') {
    groups.sort((a, b) => {
      const idxA = parseInt(a.mainRow.getAttribute('data-orig-idx') || '0', 10);
      const idxB = parseInt(b.mainRow.getAttribute('data-orig-idx') || '0', 10);
      return idxA - idxB;
    });
  } else {
    groups.sort((a, b) => {
      const cellA = a.mainRow.children[colIdx];
      const cellB = b.mainRow.children[colIdx];
      const res = compareTableCells(cellA, cellB);
      return dir === 'asc' ? res : -res;
    });
  }

  // Check if rows are already in correct order to avoid modifying DOM
  let alreadyOrdered = true;
  let childIdx = 0;
  for (const g of groups) {
    if (tbody.children[childIdx] !== g.mainRow) {
      alreadyOrdered = false;
      break;
    }
    childIdx++;
    for (const sub of g.subRows) {
      if (tbody.children[childIdx] !== sub) {
        alreadyOrdered = false;
        break;
      }
      childIdx++;
    }
  }

  if (alreadyOrdered) {
    tbody._isSorting = false;
    return;
  }

  // Disconnect observer while re-ordering to prevent recursion and thrashing
  if (tbody._sortObserver) {
    tbody._sortObserver.disconnect();
  }

  // Re-append rows in sorted order
  groups.forEach(g => {
    tbody.appendChild(g.mainRow);
    g.subRows.forEach(sub => tbody.appendChild(sub));
  });

  // Drain any queued mutations and re-connect observer
  if (tbody._sortObserver) {
    tbody._sortObserver.takeRecords();
    tbody._sortObserver.observe(tbody, { childList: true });
  }

  tbody._isSorting = false;
}

function getCellRawText(cell) {
  if (!cell) return '';
  if (cell.hasAttribute('data-sort-value')) return cell.getAttribute('data-sort-value');
  const input = cell.querySelector('input, select');
  if (input) {
    if (input.type === 'checkbox') return input.checked ? '1' : '0';
    return input.value;
  }
  return cell.innerText.trim();
}

function parseTrafficToNumber(str) {
  const m = str.match(/^([\d.,]+)\s*([KMGTkmgt]?[iI]?[Bb](?:ps|\/s)?)/);
  if (!m) return null;
  const num = parseFloat(m[1].replace(/,/g, ''));
  if (isNaN(num)) return null;
  const unit = m[2].toUpperCase();
  let mult = 1;
  if (unit.startsWith('K')) mult = 1024;
  else if (unit.startsWith('M')) mult = 1024 * 1024;
  else if (unit.startsWith('G')) mult = 1024 * 1024 * 1024;
  else if (unit.startsWith('T')) mult = 1024 * 1024 * 1024 * 1024;
  return num * mult;
}

function parseIpToNumber(str) {
  const clean = str.replace(/^[!~]/, '').trim();
  const m = clean.match(/^(\d{1,3})\.(\d{1,3})\.(\d{1,3})\.(\d{1,3})(?:\/(\d{1,2}))?/);
  if (!m) return null;
  const o1 = parseInt(m[1], 10);
  const o2 = parseInt(m[2], 10);
  const o3 = parseInt(m[3], 10);
  const o4 = parseInt(m[4], 10);
  if (o1 > 255 || o2 > 255 || o3 > 255 || o4 > 255) return null;
  return ((o1 * 256 + o2) * 256 + o3) * 256 + o4;
}

function parseCompoundPackets(str) {
  const m = str.match(/^([\d,]+)p/);
  if (!m) return null;
  return parseInt(m[1].replace(/,/g, ''), 10);
}

function compareTableCells(cellA, cellB) {
  const a = getCellRawText(cellA);
  const b = getCellRawText(cellB);

  if (a === '' && b !== '') return 1;
  if (b === '' && a !== '') return -1;
  if (a === b) return 0;

  // 1. IP Addresses / CIDR
  const ipA = parseIpToNumber(a);
  const ipB = parseIpToNumber(b);
  if (ipA !== null && ipB !== null) return ipA - ipB;

  // 2. Packet counts (e.g. "1,250p / 45 KB")
  const pktA = parseCompoundPackets(a);
  const pktB = parseCompoundPackets(b);
  if (pktA !== null && pktB !== null) return pktA - pktB;

  // 3. Traffic / Throughput / Bytes (e.g. "1.2 MB", "500 KiB", "10 Gbps")
  const trafA = parseTrafficToNumber(a);
  const trafB = parseTrafficToNumber(b);
  if (trafA !== null && trafB !== null) return trafA - trafB;

  // 4. Numbers with '#' or formatted with commas (e.g. "#1", "24", "1,200")
  const cleanNumA = a.replace(/^[#\s]+/, '').replace(/,/g, '').trim();
  const cleanNumB = b.replace(/^[#\s]+/, '').replace(/,/g, '').trim();
  const numA = Number(cleanNumA);
  const numB = Number(cleanNumB);
  if (!isNaN(numA) && !isNaN(numB) && cleanNumA !== '' && cleanNumB !== '') {
    return numA - numB;
  }

  // 5. Natural case-insensitive string compare
  return a.localeCompare(b, undefined, { numeric: true, sensitivity: 'base' });
}

// ==================== VRRP HIGH AVAILABILITY CONTROLLER ====================
async function loadVRRP(showToastNotification = false) {
  try {
    const [instRes, sumRes] = await Promise.all([
      fetch(`${API_BASE}/vrrp/instances`),
      fetch(`${API_BASE}/vrrp/summary`)
    ]);

    if (instRes.ok) {
      state.vrrpInstances = await instRes.json();
      renderVRRP();
    }
    if (sumRes.ok) {
      state.vrrpSummary = await sumRes.json();
      renderVRRPSummary();
    }
    if (showToastNotification) {
      showToast('Refreshed', 'VRRP telemetry refreshed', 'info');
    }
  } catch (err) {
    console.error('Failed to load VRRP:', err);
  }
}

function renderVRRPSummary() {
  const s = state.vrrpSummary || { total_instances: 0, master_instances: 0, backup_instances: 0 };
  const elTotal = document.getElementById('vrrp-stat-total');
  if (elTotal) elTotal.innerText = s.total_instances || 0;
  const elMaster = document.getElementById('vrrp-stat-master');
  if (elMaster) elMaster.innerText = s.master_instances || 0;
  const elBackup = document.getElementById('vrrp-stat-backup');
  if (elBackup) elBackup.innerText = s.backup_instances || 0;

  const bCount = document.getElementById('badge-vrrp-count');
  if (bCount) bCount.innerText = s.total_instances || 0;
  const dot = document.getElementById('badge-vrrp-dot');
  if (dot) {
    if (s.master_instances > 0) {
      dot.className = 'w-2 h-2 rounded-full bg-emerald-400 animate-pulse';
    } else if (s.backup_instances > 0) {
      dot.className = 'w-2 h-2 rounded-full bg-sky-400';
    } else {
      dot.className = 'w-2 h-2 rounded-full bg-slate-600';
    }
  }
}

function renderVRRP() {
  const tbody = document.getElementById('vrrp-table-tbody');
  const empty = document.getElementById('vrrp-table-empty');
  if (!tbody) return;
  tbody.innerHTML = '';

  const instances = state.vrrpInstances || [];
  if (instances.length === 0) {
    empty?.classList.remove('hidden');
    return;
  }
  empty?.classList.add('hidden');

  instances.forEach(inst => {
    const tr = document.createElement('tr');
    tr.className = `hover:bg-slate-800/40 transition text-xs ${inst.disabled ? 'opacity-50' : ''}`;

    // Render Flag: M (Master), B (Backup), F (Fault), X (Disabled)
    let flagHtml = `<span class="inline-flex items-center justify-center w-5 h-5 rounded-md font-mono font-bold text-[11px] bg-slate-800 text-slate-500 border border-slate-700">-</span>`;
    if (inst.disabled) {
      flagHtml = `<span class="inline-flex items-center justify-center w-5 h-5 rounded-md font-mono font-bold text-[11px] bg-rose-500/20 text-rose-400 border border-rose-500/40 shadow-sm" title="Disabled">X</span>`;
    } else if (inst.state === 'MASTER') {
      flagHtml = `<span class="inline-flex items-center justify-center w-5 h-5 rounded-md font-mono font-bold text-[11px] bg-emerald-500/20 text-emerald-400 border border-emerald-500/40 shadow-sm" title="Master (Holding VIP)">M</span>`;
    } else if (inst.state === 'BACKUP') {
      flagHtml = `<span class="inline-flex items-center justify-center w-5 h-5 rounded-md font-mono font-bold text-[11px] bg-sky-500/20 text-sky-400 border border-sky-500/40 shadow-sm" title="Backup (Standby)">B</span>`;
    } else if (inst.state === 'FAULT') {
      flagHtml = `<span class="inline-flex items-center justify-center w-5 h-5 rounded-md font-mono font-bold text-[11px] bg-amber-500/20 text-amber-400 border border-amber-500/40 shadow-sm" title="Fault (Interface Down)">F</span>`;
    }

    // Render State Badge
    let stateBadge = `<span class="px-2 py-0.5 rounded text-[10px] bg-slate-800 text-slate-400 border border-slate-700">DISABLED</span>`;
    if (!inst.disabled) {
      if (inst.state === 'MASTER') {
        stateBadge = `<span class="px-2 py-0.5 rounded text-[10px] bg-emerald-500/20 text-emerald-300 border border-emerald-500/40 font-bold inline-flex items-center gap-1.5"><span class="w-1.5 h-1.5 rounded-full bg-emerald-400 animate-pulse"></span>MASTER</span>`;
      } else if (inst.state === 'BACKUP') {
        stateBadge = `<span class="px-2 py-0.5 rounded text-[10px] bg-sky-500/20 text-sky-300 border border-sky-500/40 font-bold inline-flex items-center gap-1.5"><span class="w-1.5 h-1.5 rounded-full bg-sky-400"></span>BACKUP</span>`;
      } else if (inst.state === 'FAULT') {
        stateBadge = `<span class="px-2 py-0.5 rounded text-[10px] bg-amber-500/20 text-amber-300 border border-amber-500/40 font-bold inline-flex items-center gap-1.5"><span class="w-1.5 h-1.5 rounded-full bg-amber-400"></span>FAULT</span>`;
      }
    }

    const vipsStr = (inst.virtual_ips || []).join(', ') || '-';

    tr.innerHTML = `
      <td class="py-2.5 px-3 text-center">${flagHtml}</td>
      <td class="py-2.5 px-3 font-bold text-white font-mono">${escapeHtml(inst.name)}</td>
      <td class="py-2.5 px-3 font-mono text-cyan-400 font-semibold">${escapeHtml(inst.interface)}</td>
      <td class="py-2.5 px-3 font-mono font-bold text-center text-white">${inst.vrid}</td>
      <td class="py-2.5 px-3 font-mono text-center text-slate-300 font-semibold">${inst.priority}</td>
      <td class="py-2.5 px-3 font-mono text-emerald-400 font-bold"><span class="px-2 py-0.5 rounded bg-emerald-500/10 border border-emerald-500/20">${escapeHtml(vipsStr)}</span></td>
      <td class="py-2.5 px-3 font-mono text-center text-slate-300">${inst.preempt ? '<span class="text-emerald-400 font-semibold">yes</span>' : '<span class="text-slate-500">no</span>'}</td>
      <td class="py-2.5 px-3 font-mono text-slate-400 text-[11px]">${escapeHtml(inst.virtual_mac || '-')}</td>
      <td class="py-2.5 px-3 text-center">${stateBadge}</td>
      <td class="py-2.5 px-3 text-slate-400 italic truncate max-w-[140px]" title="${escapeHtml(inst.comment || '')}">${escapeHtml(inst.comment || '-')}</td>
      <td class="py-2.5 px-3 text-right space-x-1.5 font-sans whitespace-nowrap">
        <button onclick="toggleVRRPState('${inst.id}', ${!inst.disabled})" class="text-xs ${inst.disabled ? 'text-emerald-400' : 'text-slate-400'} hover:underline">${inst.disabled ? 'Enable' : 'Disable'}</button>
        <button onclick="openEditVRRPModal('${inst.id}')" class="text-xs text-slate-400 hover:text-white">Edit</button>
        <button onclick="deleteVRRP('${inst.id}', '${escapeHtml(inst.name)}')" class="text-xs text-rose-400 hover:text-rose-300">Delete</button>
      </td>
    `;
    tbody.appendChild(tr);
  });
}

function populateVRRPIfaceSelect(elemId, selectedIface) {
  const sel = document.getElementById(elemId);
  if (!sel) return;
  sel.innerHTML = '<option value="">Select interface...</option>';
  const ifaces = state.interfaces || [];
  ifaces.forEach(i => {
    const opt = document.createElement('option');
    opt.value = i.name;
    opt.innerText = `${i.name} (${i.type || 'net'}${i.ip ? ' - ' + i.ip : ''})`;
    if (selectedIface && selectedIface === i.name) opt.selected = true;
    sel.appendChild(opt);
  });
}

function openAddVRRPModal() {
  document.getElementById('modal-vrrp-title').innerText = 'Add VRRP Instance';
  document.getElementById('modal-vrrp-id').value = '';
  document.getElementById('modal-vrrp-name').value = `vrrp${(state.vrrpInstances || []).length + 1}`;
  document.getElementById('modal-vrrp-vrid').value = 10 + (state.vrrpInstances || []).length;
  document.getElementById('modal-vrrp-priority').value = 100;
  document.getElementById('modal-vrrp-vip').value = '192.168.88.254/24';
  document.getElementById('modal-vrrp-version').value = '3';
  document.getElementById('modal-vrrp-interval').value = 1;
  document.getElementById('modal-vrrp-authtype').value = 'none';
  document.getElementById('modal-vrrp-authpass').value = '';
  document.getElementById('modal-vrrp-comment').value = '';
  document.getElementById('modal-vrrp-preempt').checked = true;
  document.getElementById('modal-vrrp-disabled').checked = false;

  populateVRRPIfaceSelect('modal-vrrp-iface', '');
  document.getElementById('modal-vrrp-instance').classList.remove('hidden');
}

function openEditVRRPModal(id) {
  const inst = (state.vrrpInstances || []).find(item => item.id === id);
  if (!inst) return;
  document.getElementById('modal-vrrp-title').innerText = `Edit VRRP Instance (${inst.name})`;
  document.getElementById('modal-vrrp-id').value = inst.id;
  document.getElementById('modal-vrrp-name').value = inst.name;
  document.getElementById('modal-vrrp-vrid').value = inst.vrid;
  document.getElementById('modal-vrrp-priority').value = inst.priority;
  document.getElementById('modal-vrrp-vip').value = (inst.virtual_ips || []).join(', ');
  document.getElementById('modal-vrrp-version').value = String(inst.version || 3);
  document.getElementById('modal-vrrp-interval').value = inst.interval || 1;
  document.getElementById('modal-vrrp-authtype').value = inst.auth_type || 'none';
  document.getElementById('modal-vrrp-authpass').value = inst.auth_password || '';
  document.getElementById('modal-vrrp-comment').value = inst.comment || '';
  document.getElementById('modal-vrrp-preempt').checked = inst.preempt !== false;
  document.getElementById('modal-vrrp-disabled').checked = !!inst.disabled;

  populateVRRPIfaceSelect('modal-vrrp-iface', inst.interface);
  document.getElementById('modal-vrrp-instance').classList.remove('hidden');
}

function closeVRRPModal() {
  document.getElementById('modal-vrrp-instance').classList.add('hidden');
}

async function submitSaveVRRP(e) {
  e.preventDefault();
  const id = document.getElementById('modal-vrrp-id').value;
  const name = document.getElementById('modal-vrrp-name').value.trim();
  const iface = document.getElementById('modal-vrrp-iface').value;
  const vrid = parseInt(document.getElementById('modal-vrrp-vrid').value, 10) || 1;
  const priority = parseInt(document.getElementById('modal-vrrp-priority').value, 10) || 100;
  const vipRaw = document.getElementById('modal-vrrp-vip').value.trim();
  const version = parseInt(document.getElementById('modal-vrrp-version').value, 10) || 3;
  const interval = parseInt(document.getElementById('modal-vrrp-interval').value, 10) || 1;
  const authType = document.getElementById('modal-vrrp-authtype').value;
  const authPass = document.getElementById('modal-vrrp-authpass').value.trim();
  const comment = document.getElementById('modal-vrrp-comment').value.trim();
  const preempt = document.getElementById('modal-vrrp-preempt').checked;
  const disabled = document.getElementById('modal-vrrp-disabled').checked;

  const vips = vipRaw.split(',').map(s => s.trim()).filter(Boolean);

  try {
    const res = await fetch(`${API_BASE}/vrrp/instances`, {
      method: 'POST',
      headers: { 'Content-Type': 'application/json' },
      body: JSON.stringify({
        id,
        name,
        interface: iface,
        vrid,
        priority,
        virtual_ips: vips,
        version,
        interval,
        auth_type: authType,
        auth_password: authPass,
        comment,
        preempt,
        disabled
      })
    });
    if (res.ok) {
      showToast('VRRP Saved', `VRRP instance ${name} configured`, 'success');
      closeVRRPModal();
      loadVRRP(false);
      fetchData(false);
    } else {
      const err = await res.text();
      showToast('Error', err, 'error');
    }
  } catch (err) {
    showToast('Error', err.message, 'error');
  }
}

async function deleteVRRP(id, name) {
  if (!confirm(`Delete VRRP instance "${name}"?`)) return;
  try {
    const res = await fetch(`${API_BASE}/vrrp/instances/${encodeURIComponent(id)}`, { method: 'DELETE' });
    if (res.ok) {
      showToast('Deleted', `VRRP instance ${name} removed`, 'info');
      loadVRRP(false);
      fetchData(false);
    } else {
      const err = await res.text();
      showToast('Error', err, 'error');
    }
  } catch (err) {
    showToast('Error', err.message, 'error');
  }
}

async function toggleVRRPState(id, disabled) {
  try {
    const res = await fetch(`${API_BASE}/vrrp/instances/${encodeURIComponent(id)}/state`, {
      method: 'POST',
      headers: { 'Content-Type': 'application/json' },
      body: JSON.stringify({ disabled })
    });
    if (res.ok) {
      showToast('State Updated', disabled ? 'VRRP disabled' : 'VRRP enabled', 'info');
      loadVRRP(false);
      fetchData(false);
    } else {
      const err = await res.text();
      showToast('Error', err, 'error');
    }
  } catch (err) {
    showToast('Error', err.message, 'error');
  }
}

// Global observer for dynamically injected tables (e.g. inside modals or drawers)
if (typeof MutationObserver !== 'undefined' && typeof document !== 'undefined') {
  let docSortDebounce = null;
  const docTableObserver = new MutationObserver((mutations) => {
    let needsInit = false;
    for (const m of mutations) {
      for (const node of m.addedNodes) {
        if (node.nodeType === 1) {
          if (node.tagName === 'TABLE' && !node.closest('tbody, thead')) {
            needsInit = true;
            break;
          } else if (node.querySelector && !node.closest('table') && node.querySelector('table')) {
            needsInit = true;
            break;
          }
        }
      }
      if (needsInit) break;
    }
    if (needsInit) {
      clearTimeout(docSortDebounce);
      docSortDebounce = setTimeout(initTableSorting, 100);
    }
  });
  docTableObserver.observe(document.body || document.documentElement, { childList: true, subtree: true });
}

// =========================================================================
// BANDWIDTH TEST (BwTest) BENCHMARK ENGINE
// =========================================================================

const bwtestState = {
  running: false,
  pollTimer: null,
  eventSource: null,
  chartPoints: [],
  maxChartPoints: 60,
  serverConfig: null,
  peakTx: 0,
  peakRx: 0,
  targetDuration: 10,
  lastSampleElapsed: -1,
  sessionID: null
};

async function loadBwTestView() {
  resizeBwTestCanvas();
  await Promise.all([fetchBwTestServerStatus(), loadBwTestHistory(), checkActiveBwTest()]);
}

async function fetchBwTestServerStatus() {
  try {
    const res = await fetch(`${API_BASE}/tools/bwtest/server`);
    if (!res.ok) return;
    const s = await res.json();
    bwtestState.serverConfig = s;

    // Update indicator and badges
    const indicator = document.getElementById('bwtest-server-indicator');
    const badge = document.getElementById('bwtest-server-badge');
    const sideBadge = document.getElementById('badge-bwtest-server');

    if (s.enabled && s.running) {
      if (indicator) indicator.className = 'w-2 h-2 rounded-full bg-emerald-400 animate-pulse';
      if (badge) {
        badge.innerText = `Port ${s.port} (Active)`;
        badge.className = 'text-emerald-400 font-bold';
      }
      if (sideBadge) {
        sideBadge.innerText = s.port;
        sideBadge.className = 'text-[10px] bg-emerald-950 text-emerald-300 border border-emerald-800/40 px-1.5 py-0.2 rounded-full font-mono';
      }
    } else {
      if (indicator) indicator.className = 'w-2 h-2 rounded-full bg-slate-600';
      if (badge) {
        badge.innerText = `Disabled`;
        badge.className = 'text-slate-500 font-bold';
      }
      if (sideBadge) {
        sideBadge.innerText = 'Off';
        sideBadge.className = 'text-[10px] bg-slate-800 text-slate-500 border border-slate-700 px-1.5 py-0.2 rounded-full font-mono';
      }
    }

    // Modal fields
    const toggle = document.getElementById('bwtest-server-enable-toggle');
    const serverModal = document.getElementById('modal-bwtest-server');
    const editing = serverModal && !serverModal.classList.contains('hidden');
    if (toggle && !editing) toggle.checked = !!s.enabled;
    const portInp = document.getElementById('bwtest-server-port-input');
    if (portInp && !editing) portInp.value = s.port || 2000;
    const actSess = document.getElementById('bwtest-modal-active-sessions');
    if (actSess) actSess.innerText = s.active_sessions || 0;
    const totServ = document.getElementById('bwtest-modal-total-served');
    if (totServ) totServ.innerText = s.total_sessions_served || 0;
    const totBytes = document.getElementById('bwtest-modal-total-bytes');
    if (totBytes) totBytes.innerText = formatBytes(s.total_bytes_processed || 0);

  } catch (err) {
    console.error('Failed to fetch BwTest server status:', err);
  }
}

function openBwTestServerModal() {
  const cfg = bwtestState.serverConfig;
  if (cfg) {
    document.getElementById('bwtest-server-enable-toggle').checked = !!cfg.enabled;
    document.getElementById('bwtest-server-port-input').value = cfg.port || 2000;
  }
  fetchBwTestServerStatus();
  document.getElementById('modal-bwtest-server')?.classList.remove('hidden');
}

function closeBwTestServerModal() {
  document.getElementById('modal-bwtest-server')?.classList.add('hidden');
}

async function submitBwTestServerSettings(e) {
  e.preventDefault();
  const enabled = document.getElementById('bwtest-server-enable-toggle').checked;
  const port = parseInt(document.getElementById('bwtest-server-port-input').value, 10) || 2000;

  try {
    const res = await fetch(`${API_BASE}/tools/bwtest/server`, {
      method: 'POST',
      headers: { 'Content-Type': 'application/json' },
      body: JSON.stringify({ enabled, port, listen_addr: '0.0.0.0', allow_anonymous: true })
    });
    if (!res.ok) {
      const err = await res.json();
      throw new Error(err.error || 'Failed to update server configuration');
    }
    showToast('BwTest Server', `Bandwidth Test server updated (Port ${port})`, 'success');
    closeBwTestServerModal();
    fetchBwTestServerStatus();
  } catch (err) {
    showToast('Server Configuration Error', err.message, 'error');
  }
}

function setBwTestTarget(target) {
  const inp = document.getElementById('bwtest-input-target');
  if (inp) inp.value = target;
}

function setBwTestProtocol(proto) {
  const hiddenInp = document.getElementById('bwtest-input-protocol');
  if (hiddenInp) hiddenInp.value = proto;

  const btnUdp = document.getElementById('bwtest-proto-udp');
  const btnTcp = document.getElementById('bwtest-proto-tcp');
  const badge = document.getElementById('bwtest-proto-badge');
  const pktField = document.getElementById('bwtest-field-pktsize');

  const activeUdpCls = 'py-2.5 px-3 rounded-lg text-xs font-bold border transition text-center bg-emerald-600/20 border-emerald-500/50 text-emerald-300 shadow-sm flex items-center justify-center gap-2';
  const activeTcpCls = 'py-2.5 px-3 rounded-lg text-xs font-bold border transition text-center bg-blue-600/20 border-blue-500/50 text-blue-300 shadow-sm flex items-center justify-center gap-2';
  const inactiveCls = 'py-2.5 px-3 rounded-lg text-xs font-medium border border-slate-800 bg-slate-950 text-slate-400 hover:text-white transition text-center flex items-center justify-center gap-2';

  if (proto === 'udp') {
    if (btnUdp) {
      btnUdp.className = activeUdpCls;
      const dot = btnUdp.querySelector('span');
      if (dot) dot.className = 'w-2 h-2 rounded-full bg-emerald-400';
    }
    if (btnTcp) {
      btnTcp.className = inactiveCls;
      const dot = btnTcp.querySelector('span');
      if (dot) dot.className = 'w-2 h-2 rounded-full bg-slate-600';
    }
    if (badge) {
      badge.innerText = 'UDP Mode (RFC 3550 Jitter + Loss %)';
      badge.className = 'text-[10px] font-mono text-emerald-400 bg-emerald-500/10 px-2 py-0.5 rounded border border-emerald-500/20';
    }
    if (pktField) pktField.classList.remove('opacity-40');
  } else {
    if (btnUdp) {
      btnUdp.className = inactiveCls;
      const dot = btnUdp.querySelector('span');
      if (dot) dot.className = 'w-2 h-2 rounded-full bg-slate-600';
    }
    if (btnTcp) {
      btnTcp.className = activeTcpCls;
      const dot = btnTcp.querySelector('span');
      if (dot) dot.className = 'w-2 h-2 rounded-full bg-blue-400';
    }
    if (badge) {
      badge.innerText = 'TCP Mode (Sliding Window Throughput)';
      badge.className = 'text-[10px] font-mono text-blue-400 bg-blue-500/10 px-2 py-0.5 rounded border border-blue-500/20';
    }
    if (pktField) pktField.classList.add('opacity-40');
  }
}

function setBwTestDirection(dir) {
  const hiddenInp = document.getElementById('bwtest-input-direction');
  if (hiddenInp) hiddenInp.value = dir;

  const btnBoth = document.getElementById('bwtest-dir-both');
  const btnTx = document.getElementById('bwtest-dir-tx');
  const btnRx = document.getElementById('bwtest-dir-rx');

  const activeCls = 'py-2 px-2 rounded-lg text-xs font-bold border transition text-center bg-emerald-600/20 border-emerald-500/50 text-emerald-300 shadow-sm';
  const inactiveCls = 'py-2 px-2 rounded-lg text-xs font-medium border border-slate-800 bg-slate-950 text-slate-400 hover:text-white transition text-center';

  if (btnBoth) btnBoth.className = dir === 'both' ? activeCls : inactiveCls;
  if (btnTx) btnTx.className = dir === 'tx' ? activeCls : inactiveCls;
  if (btnRx) btnRx.className = dir === 'rx' ? activeCls : inactiveCls;
}

function setBwTestLimit(bps) {
  const sel = document.getElementById('bwtest-input-limit');
  if (sel) sel.value = String(bps);
}

async function checkActiveBwTest() {
  try {
    const res = await fetch(`${API_BASE}/tools/bwtest/status`);
    if (!res.ok) return;
    const st = await res.json();
    if (st.running) {
      setBwTestRunningUI(true);
      processBwTestStatus(st);
      startBwTestTelemetry();
    }
  } catch (err) {
    console.error('Failed to check active BwTest:', err);
  }
}

async function startBwTest(e) {
  if (e && e.preventDefault) e.preventDefault();

  const target = document.getElementById('bwtest-input-target').value.trim() || '127.0.0.1';
  const port = parseInt(document.getElementById('bwtest-input-port').value, 10) || 2000;
  const direction = document.getElementById('bwtest-input-direction').value || 'both';
  const protocol = document.getElementById('bwtest-input-protocol').value || 'udp';
  const bandwidth_limit = parseInt(document.getElementById('bwtest-input-limit').value, 10) || 0;
  const packet_size = parseInt(document.getElementById('bwtest-input-pktsize').value, 10) || 1472;
  const streams = parseInt(document.getElementById('bwtest-input-streams').value, 10) || 1;
  const duration = parseInt(document.getElementById('bwtest-input-duration').value, 10);

  bwtestState.targetDuration = duration;
  bwtestState.chartPoints = [];
  bwtestState.peakTx = 0;
  bwtestState.peakRx = 0;
  bwtestState.lastSampleElapsed = -1;
  bwtestState.sessionID = null;

  // Clear UI elements
  document.getElementById('bwtest-stat-tx-mbps').innerText = '0.00';
  document.getElementById('bwtest-stat-tx-peak').innerText = '0.00 Mbps';
  document.getElementById('bwtest-stat-tx-pkts').innerText = '0';
  document.getElementById('bwtest-stat-rx-mbps').innerText = '0.00';
  document.getElementById('bwtest-stat-rx-peak').innerText = '0.00 Mbps';
  document.getElementById('bwtest-stat-rx-pkts').innerText = '0';
  document.getElementById('bwtest-stat-loss').innerText = '0.0%';
  document.getElementById('bwtest-stat-jitter').innerText = '0.00 ms';
  document.getElementById('bwtest-stat-time').innerText = '0.0s';
  document.getElementById('bwtest-stat-data').innerText = '0.0 MB';
  document.getElementById('bwtest-stat-target-dur').innerText = duration > 0 ? `/ ${duration}s` : '/ ∞';

  const tbody = document.getElementById('bwtest-samples-tbody');
  if (tbody) tbody.innerHTML = '';
  document.getElementById('bwtest-sample-count').innerText = '0 samples';

  setBwTestRunningUI(true);

  try {
    const res = await fetch(`${API_BASE}/tools/bwtest/start`, {
      method: 'POST',
      headers: { 'Content-Type': 'application/json' },
      body: JSON.stringify({
        target,
        port,
        direction,
        protocol,
        bandwidth_limit,
        packet_size,
        streams,
        duration
      })
    });

    if (!res.ok) {
      const err = await res.json();
      throw new Error(err.error || 'Failed to start bandwidth test');
    }

    showToast('Benchmark Started', `Target: ${target}:${port} (${direction.toUpperCase()}, ${protocol.toUpperCase()})`, 'info');
    startBwTestTelemetry();
  } catch (err) {
    setBwTestRunningUI(false);
    showToast('Start Failed', err.message, 'error');
  }
}

function setBwTestRunningUI(running) {
  bwtestState.running = running;
  const startBtn = document.getElementById('bwtest-btn-start');
  const stopBtn = document.getElementById('bwtest-btn-stop');
  const badge = document.getElementById('bwtest-run-status-badge');
  const ph = document.getElementById('bwtest-chart-placeholder');

  if (running) {
    if (startBtn) {
      startBtn.disabled = true;
      startBtn.classList.add('opacity-50', 'cursor-not-allowed');
    }
    if (stopBtn) {
      stopBtn.disabled = false;
      stopBtn.classList.remove('opacity-40');
    }
    if (badge) {
      badge.innerText = 'TESTING...';
      badge.className = 'px-2 py-0.5 rounded text-[10px] font-mono bg-emerald-500/20 text-emerald-300 border border-emerald-500/40 font-bold animate-pulse';
    }
    if (ph) ph.style.display = 'none';
  } else {
    if (startBtn) {
      startBtn.disabled = false;
      startBtn.classList.remove('opacity-50', 'cursor-not-allowed');
    }
    if (stopBtn) {
      stopBtn.disabled = true;
      stopBtn.classList.add('opacity-40');
    }
    if (badge) {
      badge.innerText = 'IDLE';
      badge.className = 'px-2 py-0.5 rounded text-[10px] font-mono bg-slate-800 text-slate-400 border border-slate-700 font-semibold';
    }
  }
}

async function stopBwTest() {
  try {
    const res = await fetch(`${API_BASE}/tools/bwtest/stop`, { method: 'POST' });
    if (!res.ok) throw new Error(await responseError(res));
    showToast('Stop Requested', 'Waiting for the bandwidth test to finish', 'info');
    if (!bwtestState.pollTimer) startBwTestTelemetry();
  } catch (err) {
    showToast('Stop Failed', err.message, 'error');
  }
}

async function responseError(res) {
  const text = await res.text();
  try { const data = JSON.parse(text); return data.message || (typeof data.error === 'string' ? data.error : null) || `HTTP ${res.status}`; }
  catch { return text || `HTTP ${res.status}`; }
}

function processBwTestStatus(st) {
  if (st.session_id && bwtestState.sessionID !== st.session_id) {
    bwtestState.sessionID = st.session_id;
    bwtestState.lastSampleElapsed = -1;
  }
  for (const sample of st.recent_samples || []) {
    if (sample.elapsed_sec > (bwtestState.lastSampleElapsed ?? -1)) {
      handleBwTestSample(sample);
      bwtestState.lastSampleElapsed = sample.elapsed_sec;
    }
  }
  if (!st.running) {
    if (bwtestState.pollTimer) clearInterval(bwtestState.pollTimer);
    bwtestState.pollTimer = null;
    setBwTestRunningUI(false);
    handleBwTestFinish(st.summary, st.error);
  }
}

function startBwTestTelemetry() {
  if (!state.currentUser) return;
  if (bwtestState.pollTimer) clearInterval(bwtestState.pollTimer);
  let busy = false;
  const poll = async () => {
    if (busy || !state.currentUser || document.hidden) return;
    busy = true;
    try {
      const res = await fetch(`${API_BASE}/tools/bwtest/status`);
      if (!res.ok) throw new Error(await responseError(res));
      processBwTestStatus(await res.json());
    } catch (err) {
      console.error('BwTest polling error:', err);
    } finally { busy = false; }
  };
  bwtestState.pollTimer = setInterval(poll, 400);
  poll();
}

function handleBwTestSample(s) {
  if (!s) return;

  const payloadHint = document.getElementById('bwtest-effective-payload');
  if (payloadHint && s.packet_size) payloadHint.innerText = `Effective datagram: ${s.packet_size} bytes`;
  const txMbps = s.tx_mbps || 0;
  const rxMbps = s.rx_mbps || 0;

  if (txMbps > bwtestState.peakTx) bwtestState.peakTx = txMbps;
  if (rxMbps > bwtestState.peakRx) bwtestState.peakRx = rxMbps;

  // KPI updates
  const elTx = document.getElementById('bwtest-stat-tx-mbps');
  if (elTx) {
 elTx.innerText = txMbps.toFixed(2);
 elTx.title = `Confirmed by peer; locally offered: ${(s.offered_tx_mbps || 0).toFixed(2)} Mbps`;
 }
  const elTxPeak = document.getElementById('bwtest-stat-tx-peak');
  if (elTxPeak) elTxPeak.innerText = `${bwtestState.peakTx.toFixed(2)} Mbps`;
  const elTxPkts = document.getElementById('bwtest-stat-tx-pkts');
  if (elTxPkts) elTxPkts.innerText = s.tx_packets || 0;

  const elRx = document.getElementById('bwtest-stat-rx-mbps');
  if (elRx) elRx.innerText = rxMbps.toFixed(2);
  const elRxPeak = document.getElementById('bwtest-stat-rx-peak');
  if (elRxPeak) elRxPeak.innerText = `${bwtestState.peakRx.toFixed(2)} Mbps`;
  const elRxPkts = document.getElementById('bwtest-stat-rx-pkts');
  if (elRxPkts) elRxPkts.innerText = s.rx_packets || 0;

  const elLoss = document.getElementById('bwtest-stat-loss');
  if (elLoss) {
    elLoss.innerText = `${(s.loss_pct || 0).toFixed(1)}%`;
    elLoss.className = (s.loss_pct > 1.0) ? 'text-2xl font-bold text-rose-400' : 'text-2xl font-bold text-emerald-400';
  }
  const elLostPkts = document.getElementById('bwtest-stat-lost-pkts');
  if (elLostPkts) elLostPkts.innerText = s.lost_packets || 0;

  const elJitter = document.getElementById('bwtest-stat-jitter');
  if (elJitter) elJitter.innerText = `${(s.jitter_ms || 0).toFixed(2)} ms`;

  const elTime = document.getElementById('bwtest-stat-time');
  if (elTime) elTime.innerText = `${(s.elapsed_sec || 0).toFixed(1)}s`;

  const elData = document.getElementById('bwtest-stat-data');
  if (elData) elData.innerText = formatBytes((s.tx_bytes || 0) + (s.rx_bytes || 0));

  const elGraphRate = document.getElementById('bwtest-graph-rate');
  if (elGraphRate) elGraphRate.innerText = `TX: ${txMbps.toFixed(1)} Mbps • RX: ${rxMbps.toFixed(1)} Mbps`;

  // Append point to chart buffer
  bwtestState.chartPoints.push({
    elapsed: s.elapsed_sec || 0,
    tx: txMbps,
    rx: rxMbps
  });
  if (bwtestState.chartPoints.length > bwtestState.maxChartPoints) {
    bwtestState.chartPoints.shift();
  }
  drawBwTestChart();

  // Add row to breakdown table
  const tbody = document.getElementById('bwtest-samples-tbody');
  if (tbody) {
    const tr = document.createElement('tr');
    tr.className = 'hover:bg-slate-800/40 transition font-mono text-xs';
    tr.innerHTML = `
      <td class="py-1.5 px-3 font-semibold text-white">${(s.elapsed_sec || 0).toFixed(1)}s</td>
      <td class="py-1.5 px-3 font-bold text-cyan-400">${txMbps.toFixed(2)} Mbps</td>
      <td class="py-1.5 px-3 font-bold text-purple-400">${rxMbps.toFixed(2)} Mbps</td>
      <td class="py-1.5 px-3 ${(s.loss_pct > 1.0) ? 'text-rose-400 font-bold' : 'text-emerald-400'}">${(s.loss_pct || 0).toFixed(1)}%</td>
      <td class="py-1.5 px-3 text-slate-300">${(s.jitter_ms || 0).toFixed(2)} ms</td>
      <td class="py-1.5 px-3 text-slate-400">${formatBytes((s.tx_bytes || 0) + (s.rx_bytes || 0))}</td>
    `;
    tbody.insertBefore(tr, tbody.firstChild);

    const countEl = document.getElementById('bwtest-sample-count');
    if (countEl) countEl.innerText = `${tbody.children.length} samples`;
  }
}

function handleBwTestFinish(summary, error) {
  const badge = document.getElementById('bwtest-run-status-badge');
  if (error) {
    showToast('Benchmark Error', error, 'error');
    if (badge) {
      badge.innerText = 'ERROR';
      badge.className = 'px-2 py-0.5 rounded text-[10px] font-mono bg-rose-500/20 text-rose-300 border border-rose-500/40 font-bold';
    }
  } else if (summary) {
    const avgTx = summary.avg_tx_mbps.toFixed(1);
    const avgRx = summary.avg_rx_mbps.toFixed(1);
    showToast('Benchmark Complete', `Average TX: ${avgTx} Mbps | RX: ${avgRx} Mbps (Loss: ${summary.avg_loss_pct.toFixed(1)}%)`, 'success');
    if (badge) {
      badge.innerText = 'COMPLETED';
      badge.className = 'px-2 py-0.5 rounded text-[10px] font-mono bg-emerald-500/20 text-emerald-300 border border-emerald-500/40 font-bold';
    }
  }
  loadBwTestHistory();
  fetchBwTestServerStatus();
}

function resizeBwTestCanvas() {
  const canvas = document.getElementById('bwtest-chart');
  if (!canvas || !canvas.parentElement) return;
  const rect = canvas.parentElement.getBoundingClientRect();
  const dpr = window.devicePixelRatio || 1;
  canvas.width = rect.width * dpr;
  canvas.height = rect.height * dpr;
  const ctx = canvas.getContext('2d');
  ctx.scale(dpr, dpr);
  drawBwTestChart();
}

window.addEventListener('resize', () => {
  if (state.activeTab === 'bwtest') resizeBwTestCanvas();
});

function drawBwTestChart() {
  const canvas = document.getElementById('bwtest-chart');
  if (!canvas) return;
  const ctx = canvas.getContext('2d');
  const dpr = window.devicePixelRatio || 1;
  const width = canvas.width / dpr;
  const height = canvas.height / dpr;

  ctx.clearRect(0, 0, width, height);

  const points = bwtestState.chartPoints;
  if (!points || points.length === 0) return;

  // Determine scale ceiling
  let maxRate = 10;
  for (const p of points) {
    if (p.tx > maxRate) maxRate = p.tx;
    if (p.rx > maxRate) maxRate = p.rx;
  }
  maxRate = Math.ceil(maxRate * 1.25); // 25% headroom

  const paddingLeft = 55;
  const paddingBottom = 24;
  const paddingTop = 12;
  const paddingRight = 16;
  const chartW = width - paddingLeft - paddingRight;
  const chartH = height - paddingTop - paddingBottom;

  // Grid Lines and Y-Axis labels
  ctx.strokeStyle = 'rgba(51, 65, 85, 0.4)';
  ctx.lineWidth = 1;
  ctx.fillStyle = '#94a3b8';
  ctx.font = '10px monospace';
  ctx.textAlign = 'right';

  const gridSteps = 4;
  for (let i = 0; i <= gridSteps; i++) {
    const val = (maxRate / gridSteps) * i;
    const y = paddingTop + chartH - (i / gridSteps) * chartH;
    ctx.beginPath();
    ctx.moveTo(paddingLeft, y);
    ctx.lineTo(width - paddingRight, y);
    ctx.stroke();
    ctx.fillText(`${Math.round(val)}M`, paddingLeft - 8, y + 3);
  }

  // Draw TX Line (Cyan #22d3ee)
  drawSeries(ctx, points, p => p.tx, maxRate, paddingLeft, paddingTop, chartW, chartH, '#22d3ee', 'rgba(34, 211, 238, 0.15)');

  // Draw RX Line (Purple #a855f7)
  drawSeries(ctx, points, p => p.rx, maxRate, paddingLeft, paddingTop, chartW, chartH, '#a855f7', 'rgba(168, 85, 247, 0.15)');
}

function drawSeries(ctx, points, valFn, maxVal, left, top, w, h, strokeColor, fillColor) {
  if (points.length < 2) return;

  const stepX = w / Math.max(points.length - 1, 1);

  // Gradient area fill
  const grad = ctx.createLinearGradient(0, top, 0, top + h);
  grad.addColorStop(0, fillColor);
  grad.addColorStop(1, 'rgba(0, 0, 0, 0)');

  ctx.beginPath();
  points.forEach((p, idx) => {
    const x = left + idx * stepX;
    const val = valFn(p);
    const y = top + h - (val / maxVal) * h;
    if (idx === 0) {
      ctx.moveTo(x, y);
    } else {
      ctx.lineTo(x, y);
    }
  });

  // Complete path for fill
  ctx.lineTo(left + (points.length - 1) * stepX, top + h);
  ctx.lineTo(left, top + h);
  ctx.closePath();
  ctx.fillStyle = grad;
  ctx.fill();

  // Draw line stroke
  ctx.beginPath();
  ctx.lineWidth = 2.5;
  ctx.strokeStyle = strokeColor;
  points.forEach((p, idx) => {
    const x = left + idx * stepX;
    const val = valFn(p);
    const y = top + h - (val / maxVal) * h;
    if (idx === 0) {
      ctx.moveTo(x, y);
    } else {
      ctx.lineTo(x, y);
    }
  });
  ctx.stroke();

  // Draw end point halo
  const lastP = points[points.length - 1];
  const lastX = left + (points.length - 1) * stepX;
  const lastY = top + h - (valFn(lastP) / maxVal) * h;

  ctx.fillStyle = strokeColor;
  ctx.beginPath();
  ctx.arc(lastX, lastY, 4, 0, 2 * Math.PI);
  ctx.fill();
}

async function loadBwTestHistory() {
  try {
    const res = await fetch(`${API_BASE}/tools/bwtest/history`);
    if (!res.ok) return;
    const list = await res.json();
    renderBwTestHistory(Array.isArray(list) ? list : []);
  } catch (err) {
    console.error('Failed to load BwTest history:', err);
  }
}

function renderBwTestHistory(list) {
  const tbody = document.getElementById('bwtest-history-tbody');
  if (!tbody) return;

  if (list.length === 0) {
    tbody.innerHTML = `<tr><td colspan="10" class="p-6 text-center text-slate-500 text-xs font-sans">No past benchmark runs recorded yet.</td></tr>`;
    return;
  }

  tbody.innerHTML = '';
  list.forEach(item => {
    const s = item.summary || {};
    const tr = document.createElement('tr');
    tr.className = 'hover:bg-slate-800/40 transition font-mono text-xs';

    const dirBadge = item.direction === 'both'
      ? `<span class="px-1.5 py-0.5 rounded text-[10px] bg-emerald-500/20 text-emerald-300 border border-emerald-500/30 uppercase font-semibold">Both</span>`
      : item.direction === 'tx'
        ? `<span class="px-1.5 py-0.5 rounded text-[10px] bg-cyan-500/20 text-cyan-300 border border-cyan-500/30 uppercase font-semibold">TX Only</span>`
        : `<span class="px-1.5 py-0.5 rounded text-[10px] bg-purple-500/20 text-purple-300 border border-purple-500/30 uppercase font-semibold">RX Only</span>`;

    const protoBadge = item.protocol === 'tcp'
      ? `<span class="px-1.5 py-0.5 rounded text-[10px] bg-blue-500/20 text-blue-300 border border-blue-500/30 font-semibold uppercase">TCP</span>`
      : `<span class="px-1.5 py-0.5 rounded text-[10px] bg-amber-500/20 text-amber-300 border border-amber-500/30 font-semibold uppercase">UDP</span>`;

    const dateStr = item.timestamp ? new Date(item.timestamp).toLocaleString() : '-';

    tr.innerHTML = `
      <td class="py-2.5 px-4 font-bold text-white font-mono text-[11px]">${escapeHtml(item.id || '-')}</td>
      <td class="py-2.5 px-4 text-emerald-400 font-mono font-medium">${escapeHtml(item.target || '-')}</td>
      <td class="py-2.5 px-4">${protoBadge}</td>
      <td class="py-2.5 px-4">${dirBadge}</td>
      <td class="py-2.5 px-4 text-slate-300">${(s.duration_sec || 0).toFixed(1)}s</td>
      <td class="py-2.5 px-4 font-bold text-cyan-400 font-mono">${(s.avg_tx_mbps || 0).toFixed(1)} / ${(s.peak_tx_mbps || 0).toFixed(1)} <span class="text-[10px] text-slate-400 font-normal">Mbps</span></td>
      <td class="py-2.5 px-4 font-bold text-purple-400 font-mono">${(s.avg_rx_mbps || 0).toFixed(1)} / ${(s.peak_rx_mbps || 0).toFixed(1)} <span class="text-[10px] text-slate-400 font-normal">Mbps</span></td>
      <td class="py-2.5 px-4 ${(s.avg_loss_pct > 1.0) ? 'text-rose-400 font-bold' : 'text-emerald-400'} font-mono">${(s.avg_loss_pct || 0).toFixed(1)}% <span class="text-[10px] text-slate-400 font-normal">(${s.total_lost_packets || 0})</span></td>
      <td class="py-2.5 px-4 text-slate-300 font-mono">${(s.avg_jitter_ms || 0).toFixed(2)} ms</td>
      <td class="py-2.5 px-4 text-slate-400 text-[11px] font-sans">${escapeHtml(dateStr)}</td>
    `;
    tbody.appendChild(tr);
  });
}

// ======================== SETTINGS & ROUTER DNS ========================
state.settingsSubTab = 'dns';
state.dnsSettings = null;
state.dnsStaticRecords = [];
state.dnsStatus = null;

function switchSettingsSubTab(sub) {
  state.settingsSubTab = sub;
  const btnDns = document.getElementById('btn-settings-subtab-dns');
  const btnSys = document.getElementById('btn-settings-subtab-system');
  const btnBak = document.getElementById('btn-settings-subtab-backup');
  const tabDns = document.getElementById('settings-subtab-dns');
  const tabSys = document.getElementById('settings-subtab-system');
  const tabBak = document.getElementById('settings-subtab-backup');

  const activeClass = 'px-3.5 py-1.5 rounded-lg text-xs font-semibold bg-cyan-600 text-white transition flex items-center gap-1.5 cursor-pointer';
  const inactiveClass = 'px-3.5 py-1.5 rounded-lg text-xs font-semibold bg-slate-800 text-slate-300 hover:text-white transition flex items-center gap-1.5 cursor-pointer';

  if (btnDns) btnDns.className = inactiveClass;
  if (btnSys) btnSys.className = inactiveClass;
  if (btnBak) btnBak.className = inactiveClass;

  tabDns?.classList.add('hidden');
  tabSys?.classList.add('hidden');
  tabBak?.classList.add('hidden');

  if (sub === 'dns') {
    if (btnDns) btnDns.className = activeClass;
    tabDns?.classList.remove('hidden');
    loadDNSSettings();
  } else if (sub === 'system') {
    if (btnSys) btnSys.className = activeClass;
    tabSys?.classList.remove('hidden');
    loadSystemSettings();
  } else if (sub === 'backup') {
    if (btnBak) btnBak.className = activeClass;
    tabBak?.classList.remove('hidden');
    loadBackupList();
  }
}

async function loadSettingsData(showLoading = false) {
  if (state.settingsSubTab === 'system') {
    await loadSystemSettings();
  } else if (state.settingsSubTab === 'backup') {
    await loadBackupList();
  } else {
    await loadDNSSettings();
  }
}

async function loadDNSSettings() {
  try {
    const [settingsRes, staticRes, statusRes] = await Promise.all([
      fetch(`${API_BASE}/dns/settings`),
      fetch(`${API_BASE}/dns/static`),
      fetch(`${API_BASE}/dns/status`)
    ]);

    if (settingsRes.ok) {
      state.dnsSettings = await settingsRes.json();
      populateDNSSettingsForm(state.dnsSettings);
    }
    if (staticRes.ok) {
      state.dnsStaticRecords = await staticRes.json();
      renderStaticDNSList();
    }
    if (statusRes.ok) {
      state.dnsStatus = await statusRes.json();
      updateDNSStatusView(state.dnsStatus);
    }
  } catch (err) {
    console.error('Failed to load DNS settings:', err);
  }
}

function populateDNSSettingsForm(s) {
  if (!s) return;
  const dnsForm = document.getElementById('form-dns-settings');
  const isEditing = dnsForm && (dnsForm.contains(document.activeElement) || dnsForm.dataset.dirty === 'true');

  const dynamicEl = document.getElementById('dns-dynamic-servers-list');
  if (dynamicEl) {
    if (Array.isArray(s.dynamic_servers) && s.dynamic_servers.length > 0) {
      dynamicEl.innerHTML = s.dynamic_servers.map(d => `<span class="px-2 py-0.5 rounded bg-cyan-950 text-cyan-300 border border-cyan-800 font-mono">${escapeHtml(d)}</span>`).join(' ');
    } else {
      dynamicEl.innerText = 'None';
    }
  }

  // If user is actively typing or editing in the form, do not overwrite their inputs!
  if (isEditing) return;

  const serversInput = document.getElementById('dns-servers-input');
  if (serversInput) serversInput.value = (s.servers || []).join(', ');

  const cacheSizeInput = document.getElementById('dns-cache-size-input');
  if (cacheSizeInput) cacheSizeInput.value = s.cache_size || 2048;

  const domainInput = document.getElementById('dns-domain-input');
  if (domainInput) domainInput.value = s.domain || '';

  const allowRemoteInput = document.getElementById('dns-allow-remote-input');
  if (allowRemoteInput) allowRemoteInput.checked = s.allow_remote_requests !== false;
}

function updateDNSStatusView(st) {
  if (!st) return;
  const preview = document.getElementById('dns-resolv-preview');
  if (preview) preview.innerText = st.resolv_conf_content || '(empty)';

  const pillText = document.getElementById('dns-live-status-text');
  const pill = document.getElementById('dns-live-status-pill');
  if (pill && pillText) {
    if (st.service_running) {
      pill.className = 'px-2.5 py-1 rounded-full text-[11px] font-mono bg-emerald-500/10 text-emerald-400 border border-emerald-500/30 flex items-center gap-1.5';
      pillText.innerText = 'DNS Service Active';
    } else {
      pill.className = 'px-2.5 py-1 rounded-full text-[11px] font-mono bg-rose-500/10 text-rose-400 border border-rose-500/30 flex items-center gap-1.5';
      pillText.innerText = 'DNS Service Inactive';
    }
  }
}

function appendDNSPreset(preset) {
  const input = document.getElementById('dns-servers-input');
  if (!input) return;
  const dnsForm = document.getElementById('form-dns-settings');
  if (dnsForm) dnsForm.dataset.dirty = 'true';
  const current = input.value.trim();
  if (!current) {
    input.value = preset;
  } else {
    const existing = current.split(/[,\s]+/).map(s => s.trim()).filter(Boolean);
    const toAdd = preset.split(/[,\s]+/).map(s => s.trim()).filter(Boolean);
    toAdd.forEach(ip => {
      if (!existing.includes(ip)) existing.push(ip);
    });
    input.value = existing.join(', ');
  }
}

async function saveDNSSettings(e) {
  e.preventDefault();
  const rawServers = document.getElementById('dns-servers-input')?.value || '';
  const servers = rawServers.split(/[,\s]+/).map(s => s.trim()).filter(Boolean);

  if (servers.length === 0) {
    showToast('Validation Error', 'Please enter at least one upstream DNS server IP', 'error');
    return;
  }

  const cacheSize = parseInt(document.getElementById('dns-cache-size-input')?.value || '2048', 10);
  const domain = (document.getElementById('dns-domain-input')?.value || '').trim();
  const allowRemote = document.getElementById('dns-allow-remote-input')?.checked ?? true;

  try {
    const res = await fetch(`${API_BASE}/dns/settings`, {
      method: 'POST',
      headers: { 'Content-Type': 'application/json' },
      body: JSON.stringify({
        servers: servers,
        cache_size: cacheSize,
        domain: domain,
        allow_remote_requests: allowRemote
      })
    });
    const data = await res.json();
    if (res.ok) {
      const dnsForm = document.getElementById('form-dns-settings');
      if (dnsForm) dnsForm.dataset.dirty = 'false';
      showToast('DNS Applied', 'Router DNS forwarders and resolver settings updated successfully', 'success');
      loadDNSSettings();
    } else {
      showToast('Error', data.error || data.message || 'Failed to save DNS settings', 'error');
    }
  } catch (err) {
    showToast('Error', err.message, 'error');
  }
}

async function flushDNSCache() {
  try {
    const res = await fetch(`${API_BASE}/dns/flush`, { method: 'POST' });
    if (res.ok) {
      showToast('Cache Flushed', 'Router DNS cache cleared and static hosts reloaded', 'success');
      loadDNSSettings();
    } else {
      const err = await res.json();
      showToast('Error', err.error || 'Failed to flush cache', 'error');
    }
  } catch (err) {
    showToast('Error', err.message, 'error');
  }
}

function renderStaticDNSList() {
  const tbody = document.getElementById('dns-static-tbody');
  const empty = document.getElementById('dns-static-empty');
  const badge = document.getElementById('dns-static-count-badge');
  if (!tbody) return;
  tbody.innerHTML = '';

  const records = state.dnsStaticRecords || [];
  if (badge) badge.innerText = `${records.length} Records`;

  if (records.length === 0) {
    empty?.classList.remove('hidden');
    return;
  }
  empty?.classList.add('hidden');

  records.forEach(rec => {
    const tr = document.createElement('tr');
    tr.className = `hover:bg-slate-800/40 transition text-xs ${rec.disabled ? 'opacity-50' : ''}`;

    tr.innerHTML = `
      <td class="py-2.5 px-4 font-bold text-white">${escapeHtml(rec.name)}</td>
      <td class="py-2.5 px-4">
        <span class="px-2 py-0.5 rounded text-[10px] font-bold ${
          rec.type === 'CNAME' ? 'bg-purple-950 text-purple-300 border border-purple-800' :
          (rec.type === 'AAAA' ? 'bg-blue-950 text-blue-300 border border-blue-800' : 'bg-cyan-950 text-cyan-300 border border-cyan-800')
        }">
          ${rec.type || 'A'}
        </span>
      </td>
      <td class="py-2.5 px-4 text-emerald-400 font-mono">${escapeHtml(rec.address)}</td>
      <td class="py-2.5 px-4 text-slate-400 font-mono">${rec.ttl || 3600}s</td>
      <td class="py-2.5 px-4 text-slate-400 italic truncate max-w-[140px]">${escapeHtml(rec.comment || '-')}</td>
      <td class="py-2.5 px-4">
        <span class="px-1.5 py-0.5 rounded text-[10px] font-semibold ${rec.disabled ? 'bg-slate-800 text-slate-500' : 'bg-emerald-500/10 text-emerald-400 border border-emerald-500/30'}">
          ${rec.disabled ? 'Disabled' : 'Active'}
        </span>
      </td>
      <td class="py-2.5 px-4 text-right space-x-2 font-sans whitespace-nowrap">
        <button onclick="toggleStaticDNS('${rec.id}', ${!rec.disabled})" class="text-xs ${rec.disabled ? 'text-emerald-400' : 'text-slate-400'} hover:underline">${rec.disabled ? 'Enable' : 'Disable'}</button>
        <button onclick="openStaticDNSModal('${rec.id}')" class="text-xs text-cyan-400 hover:text-cyan-300 font-semibold">Edit</button>
        <button onclick="deleteStaticDNS('${rec.id}')" class="text-xs text-slate-500 hover:text-rose-400">Delete</button>
      </td>
    `;
    tbody.appendChild(tr);
  });
}

function openStaticDNSModal(id = null) {
  const modal = document.getElementById('modal-static-dns');
  const title = document.getElementById('modal-static-dns-title');
  const form = document.getElementById('form-static-dns');
  if (!modal || !form) return;

  form.reset();
  document.getElementById('modal-static-dns-id').value = '';

  if (id) {
    const rec = (state.dnsStaticRecords || []).find(r => r.id === id);
    if (rec) {
      if (title) title.innerText = 'Edit Static DNS Record';
      document.getElementById('modal-static-dns-id').value = rec.id;
      document.getElementById('modal-static-dns-name').value = rec.name;
      document.getElementById('modal-static-dns-type').value = rec.type || 'A';
      document.getElementById('modal-static-dns-addr').value = rec.address;
      document.getElementById('modal-static-dns-ttl').value = rec.ttl || 3600;
      document.getElementById('modal-static-dns-comment').value = rec.comment || '';
      document.getElementById('modal-static-dns-disabled').checked = !!rec.disabled;
    }
  } else {
    if (title) title.innerText = 'Add Static DNS Record';
  }

  modal.classList.remove('hidden');
}

function closeStaticDNSModal() {
  document.getElementById('modal-static-dns')?.classList.add('hidden');
}

async function submitSaveStaticDNS(e) {
  e.preventDefault();
  const id = document.getElementById('modal-static-dns-id')?.value || '';
  const name = (document.getElementById('modal-static-dns-name')?.value || '').trim();
  const type = document.getElementById('modal-static-dns-type')?.value || 'A';
  const address = (document.getElementById('modal-static-dns-addr')?.value || '').trim();
  const ttl = parseInt(document.getElementById('modal-static-dns-ttl')?.value || '3600', 10);
  const comment = (document.getElementById('modal-static-dns-comment')?.value || '').trim();
  const disabled = document.getElementById('modal-static-dns-disabled')?.checked ?? false;

  if (!name || !address) {
    showToast('Validation Error', 'Name and Target Address are required', 'error');
    return;
  }

  try {
    const res = await fetch(`${API_BASE}/dns/static`, {
      method: 'POST',
      headers: { 'Content-Type': 'application/json' },
      body: JSON.stringify({ id, name, type, address, ttl, comment, disabled })
    });
    const data = await res.json();
    if (res.ok) {
      showToast('Static DNS Saved', `Saved record ${name} -> ${address}`, 'success');
      closeStaticDNSModal();
      loadDNSSettings();
    } else {
      showToast('Error', data.error || data.message || 'Failed to save record', 'error');
    }
  } catch (err) {
    showToast('Error', err.message, 'error');
  }
}

async function deleteStaticDNS(id) {
  if (!confirm('Are you sure you want to delete this static DNS entry?')) return;
  try {
    const res = await fetch(`${API_BASE}/dns/static/${encodeURIComponent(id)}`, { method: 'DELETE' });
    if (res.ok) {
      showToast('Deleted', 'Static DNS record deleted', 'success');
      loadDNSSettings();
    }
  } catch (err) {
    showToast('Error', err.message, 'error');
  }
}

async function toggleStaticDNS(id, disabled) {
  try {
    const res = await fetch(`${API_BASE}/dns/static/${encodeURIComponent(id)}/state`, {
      method: 'POST',
      headers: { 'Content-Type': 'application/json' },
      body: JSON.stringify({ disabled })
    });
    if (res.ok) {
      showToast('Updated', `Record ${disabled ? 'disabled' : 'enabled'}`, 'success');
      loadDNSSettings();
    }
  } catch (err) {
    showToast('Error', err.message, 'error');
  }
}

async function loadSystemSettings() {
  try {
    const sysForm = document.getElementById('form-system-settings');
    const isEditing = sysForm && (sysForm.contains(document.activeElement) || sysForm.dataset.dirty === 'true');
    const res = await fetch(`${API_BASE}/system/settings`);
    if (res.ok) {
      const data = await res.json();
      if (!isEditing) {
        const hostInput = document.getElementById('system-hostname-input');
        if (hostInput) hostInput.value = data.hostname || '';

        const tzInput = document.getElementById('system-timezone-input');
        if (tzInput && data.timezone) tzInput.value = data.timezone;
      }
    }
  } catch (err) {
    console.error('Failed to load system settings:', err);
  }
}

async function saveSystemSettings(e) {
  e.preventDefault();
  const hostname = (document.getElementById('system-hostname-input')?.value || '').trim();
  const timezone = document.getElementById('system-timezone-input')?.value || 'UTC';

  try {
    const res = await fetch(`${API_BASE}/system/settings`, {
      method: 'POST',
      headers: { 'Content-Type': 'application/json' },
      body: JSON.stringify({ hostname, timezone })
    });
    const data = await res.json();
    if (res.ok) {
      const sysForm = document.getElementById('form-system-settings');
      if (sysForm) sysForm.dataset.dirty = 'false';
      showToast('System Updated', 'Hostname and timezone saved successfully', 'success');
      const sideH = document.getElementById('side-hostname');
      if (sideH) sideH.innerText = data.hostname;
    } else {
      showToast('Error', data.error || 'Failed to save system settings', 'error');
    }
  } catch (err) {
    showToast('Error', err.message, 'error');
  }
}

// =============================================================================
//                       BACKUP & RESTORE MANAGER
// =============================================================================

state.selectedBackupFile = null;
state.inspectedBackupManifest = null;
state.pendingRestoreTarget = null;
state.backupsList = [];

async function exportBackupDownload() {
  const btn = document.getElementById('btn-export-backup');
  const commentInput = document.getElementById('backup-export-comment');
  const comment = (commentInput?.value || '').trim();

  const originalHtml = btn ? btn.innerHTML : '';
  if (btn) {
    btn.disabled = true;
    btn.innerHTML = `<span class="w-3.5 h-3.5 rounded-full border-2 border-white border-t-transparent animate-spin inline-block"></span> Generating Backup...`;
  }

  try {
    const res = await fetch(`${API_BASE}/system/backup/export?comment=${encodeURIComponent(comment)}`);
    if (!res.ok) {
      const err = await res.json().catch(() => ({}));
      showToast('Export Failed', err.message || 'Failed to generate backup archive', 'error');
      return;
    }

    const blob = await res.blob();
    const disposition = res.headers.get('Content-Disposition') || '';
    let filename = 'debtik-backup.zip';
    const match = disposition.match(/filename="?([^";]+)"?/);
    if (match && match[1]) {
      filename = match[1];
    }

    const blobUrl = window.URL.createObjectURL(blob);
    const a = document.createElement('a');
    a.href = blobUrl;
    a.download = filename;
    document.body.appendChild(a);
    a.click();
    setTimeout(() => {
      window.URL.revokeObjectURL(blobUrl);
      a.remove();
    }, 1000);

    showToast('Backup Created', `Full configuration archive saved as ${filename}`, 'success');
  } catch (err) {
    showToast('Export Error', err.message || 'Network error during download', 'error');
  } finally {
    if (btn) {
      btn.disabled = false;
      btn.innerHTML = originalHtml;
    }
  }
}

async function onBackupFileSelected(e) {
  const file = e.target.files?.[0];
  if (!file) return;

  const label = document.getElementById('backup-file-label');
  if (label) {
    label.innerText = `Selected: ${file.name} (${formatBytes(file.size)})`;
  }

  await inspectBackupFile(file);
}

async function inspectBackupFile(file) {
  const preview = document.getElementById('backup-inspect-preview');
  const restoreBtn = document.getElementById('btn-restore-backup');

  const formData = new FormData();
  formData.append('backup', file);

  try {
    const res = await fetch(`${API_BASE}/system/backup/inspect`, {
      method: 'POST',
      body: formData
    });

    const data = await res.json();
    if (!res.ok || !data.success || !data.manifest) {
      if (preview) preview.classList.add('hidden');
      if (restoreBtn) restoreBtn.disabled = true;
      showToast('Validation Error', data.message || 'Invalid or corrupted DebTik backup archive', 'error');
      return;
    }

    const mf = data.manifest;
    state.selectedBackupFile = file;
    state.inspectedBackupManifest = mf;

    const vEl = document.getElementById('backup-inspect-version');
    const hEl = document.getElementById('backup-inspect-hostname');
    const fEl = document.getElementById('backup-inspect-files');
    const dEl = document.getElementById('backup-inspect-date');
    const cEl = document.getElementById('backup-inspect-comment');

    if (vEl) vEl.innerText = `DebTik v${escapeHtml(mf.debtik_version || '1.0')}`;
    if (hEl) hEl.innerText = escapeHtml(mf.hostname || 'DebTik');
    if (fEl) fEl.innerText = `${mf.files?.length || 0} items`;
    if (dEl) dEl.innerText = mf.created_at ? new Date(mf.created_at).toLocaleString() : 'N/A';
    if (cEl) cEl.innerText = mf.comment ? `"${escapeHtml(mf.comment)}"` : '';

    if (preview) preview.classList.remove('hidden');
    if (restoreBtn) restoreBtn.disabled = false;
  } catch (err) {
    if (preview) preview.classList.add('hidden');
    if (restoreBtn) restoreBtn.disabled = true;
    showToast('Inspection Failed', err.message || 'Failed to inspect backup file', 'error');
  }
}

function confirmRestoreBackup(localFilename = null) {
  const modal = document.getElementById('modal-restore-confirm');
  const details = document.getElementById('modal-restore-details');
  const progress = document.getElementById('modal-restore-progress');
  const cancelBtn = document.getElementById('btn-cancel-restore');
  const execBtn = document.getElementById('btn-execute-restore');

  if (progress) progress.classList.add('hidden');
  if (cancelBtn) cancelBtn.disabled = false;
  if (execBtn) {
    execBtn.disabled = false;
    execBtn.innerText = 'Yes, Restore & Reload';
  }

  if (localFilename) {
    state.pendingRestoreTarget = { type: 'local', filename: localFilename };
    if (details) {
      details.innerHTML = `<div>Source: <span class="text-white font-bold">Local Safety Backup</span></div>
<div>File: <span class="text-cyan-400 font-bold">${escapeHtml(localFilename)}</span></div>`;
    }
  } else {
    if (!state.selectedBackupFile || !state.inspectedBackupManifest) {
      showToast('Error', 'Please select a valid backup archive first', 'error');
      return;
    }
    state.pendingRestoreTarget = { type: 'file', file: state.selectedBackupFile };
    const mf = state.inspectedBackupManifest;
    if (details) {
      details.innerHTML = `<div>Archive: <span class="text-white font-bold">${escapeHtml(state.selectedBackupFile.name)}</span> (${formatBytes(state.selectedBackupFile.size)})</div>
<div>Origin Hostname: <span class="text-cyan-400 font-bold">${escapeHtml(mf.hostname)}</span></div>
<div>Created: <span class="text-slate-300">${mf.created_at ? new Date(mf.created_at).toLocaleString() : 'N/A'}</span></div>
<div>Files: <span class="text-emerald-400">${mf.files?.length || 0} configuration files</span></div>`;
    }
  }

  if (modal) modal.classList.remove('hidden');
}

function closeRestoreModal() {
  const modal = document.getElementById('modal-restore-confirm');
  if (modal) modal.classList.add('hidden');
}

async function executeRestoreBackup() {
  const target = state.pendingRestoreTarget;
  if (!target) return;

  const progress = document.getElementById('modal-restore-progress');
  const progressText = document.getElementById('modal-restore-progress-text');
  const cancelBtn = document.getElementById('btn-cancel-restore');
  const execBtn = document.getElementById('btn-execute-restore');

  if (cancelBtn) cancelBtn.disabled = true;
  if (execBtn) execBtn.disabled = true;
  if (progress) progress.classList.remove('hidden');
  if (progressText) progressText.innerText = 'Restoring configuration files into appliance...';

  try {
    let res;
    if (target.type === 'file') {
      const formData = new FormData();
      formData.append('backup', target.file);
      res = await fetch(`${API_BASE}/system/backup/restore`, {
        method: 'POST',
        body: formData
      });
    } else {
      res = await fetch(`${API_BASE}/system/backups/${encodeURIComponent(target.filename)}/restore`, {
        method: 'POST'
      });
    }

    const data = await res.json();
    if (!res.ok || !data.success) {
      showToast('Restore Failed', data.message || 'Error occurred while restoring configuration', 'error');
      if (cancelBtn) cancelBtn.disabled = false;
      if (execBtn) execBtn.disabled = false;
      if (progress) progress.classList.add('hidden');
      return;
    }

    if (progressText) {
      progressText.innerText = 'Configuration applied! DebTik appliance is reloading services, reconnecting...';
    }

    pollAfterRestoreReconnect();
  } catch (err) {
    showToast('Restore Error', err.message || 'Network error during restore', 'error');
    if (cancelBtn) cancelBtn.disabled = false;
    if (execBtn) execBtn.disabled = false;
    if (progress) progress.classList.add('hidden');
  }
}

function pollAfterRestoreReconnect() {
  let attempts = 0;
  const maxAttempts = 25;

  const timer = setInterval(async () => {
    attempts++;
    try {
      const res = await fetch(`${API_BASE}/system/status`, { cache: 'no-store' });
      if (res.ok) {
        clearInterval(timer);
        closeRestoreModal();
        showToast('Restoration Complete', 'DebTik configuration restored and appliance is back online!', 'success');
        setTimeout(() => {
          window.location.reload();
        }, 1200);
      }
    } catch (_) {
      // Still restarting, retry
    }

    if (attempts >= maxAttempts) {
      clearInterval(timer);
      closeRestoreModal();
      showToast('Reload Notice', 'Restore applied. Please refresh your browser to re-authenticate.', 'info');
    }
  }, 1500);
}

async function loadBackupList() {
  const tbody = document.getElementById('backups-table-tbody');
  const empty = document.getElementById('backups-empty-state');
  if (!tbody) return;

  try {
    const res = await fetch(`${API_BASE}/system/backups`);
    if (!res.ok) return;

    const list = await res.json();
    state.backupsList = list || [];
    renderBackupsTable(state.backupsList);
  } catch (err) {
    console.error('Failed to load backup list:', err);
  }
}

function renderBackupsTable(backups) {
  const tbody = document.getElementById('backups-table-tbody');
  const empty = document.getElementById('backups-empty-state');
  if (!tbody) return;

  if (!backups || backups.length === 0) {
    tbody.innerHTML = '';
    if (empty) empty.classList.remove('hidden');
    return;
  }

  if (empty) empty.classList.add('hidden');

  tbody.innerHTML = backups.map(bk => {
    const isAuto = bk.filename && bk.filename.startsWith('pre-restore-');
    const badge = isAuto
      ? `<span class="px-2 py-0.5 rounded text-[9px] font-mono bg-amber-500/10 text-amber-300 border border-amber-500/20">PRE-RESTORE</span>`
      : `<span class="px-2 py-0.5 rounded text-[9px] font-mono bg-cyan-500/10 text-cyan-300 border border-cyan-500/20">MANUAL</span>`;

    const dateStr = bk.mod_time ? new Date(bk.mod_time).toLocaleString() : 'N/A';

    return `<tr class="hover:bg-slate-800/40 transition">
      <td class="py-3 px-4 font-bold text-white flex items-center gap-2">
        ${badge}
        <span>${escapeHtml(bk.filename)}</span>
      </td>
      <td class="py-3 px-4 text-slate-300">${escapeHtml(bk.debtik_version || '1.0')}</td>
      <td class="py-3 px-4 text-cyan-400 font-bold">${escapeHtml(bk.hostname || 'DebTik')}</td>
      <td class="py-3 px-4 text-slate-400">${dateStr}</td>
      <td class="py-3 px-4 text-slate-300">${formatBytes(bk.size)}</td>
      <td class="py-3 px-4 text-slate-400 italic">${escapeHtml(bk.comment || '—')}</td>
      <td class="py-3 px-4 text-right space-x-2">
        <button type="button" onclick="downloadLocalBackup('${escapeHtml(bk.filename)}')"
                class="px-2.5 py-1 rounded-lg text-[11px] font-semibold bg-slate-800 hover:bg-slate-700 text-cyan-400 border border-slate-700 transition cursor-pointer">
          Download
        </button>
        <button type="button" onclick="confirmRestoreBackup('${escapeHtml(bk.filename)}')"
                class="px-2.5 py-1 rounded-lg text-[11px] font-semibold bg-amber-600/20 hover:bg-amber-600/30 text-amber-300 border border-amber-500/30 transition cursor-pointer">
          Restore
        </button>
      </td>
    </tr>`;
  }).join('');
}

async function downloadLocalBackup(filename) {
  try {
    const res = await fetch(`${API_BASE}/system/backups/${encodeURIComponent(filename)}`);
    if (!res.ok) {
      showToast('Download Error', 'Failed to retrieve backup file', 'error');
      return;
    }
    const blob = await res.blob();
    const blobUrl = window.URL.createObjectURL(blob);
    const a = document.createElement('a');
    a.href = blobUrl;
    a.download = filename;
    document.body.appendChild(a);
    a.click();
    setTimeout(() => {
      window.URL.revokeObjectURL(blobUrl);
      a.remove();
    }, 1000);
  } catch (err) {
    showToast('Download Error', err.message, 'error');
  }
}

// =============================================================================
//                       AUTHENTICATION & USER MANAGER
// =============================================================================

async function checkAuthStatus() {
  try {
    const res = await originalFetch(`${API_BASE}/auth/me`, {
      headers: {
        'Authorization': `Bearer ${localStorage.getItem('debtik_token') || ''}`
      }
    });

    if (res.ok) {
      const user = await res.json();
      state.currentUser = user;
      updateUserProfileHeader(user);
      hideLoginScreen();
      state.isPolling = true;
      fetchData();
      initLiveTrafficStream();
      return true;
    } else {
      showLoginScreen(false);
      return false;
    }
  } catch (err) {
    showLoginScreen(false);
    return false;
  }
}

function showLoginScreen(isExpired = false) {
  const el = document.getElementById('login-screen');
  if (el) el.classList.remove('hidden');

  const errEl = document.getElementById('login-error');
  const errTxt = document.getElementById('login-error-text');
  if (isExpired && errEl && errTxt) {
    errTxt.innerText = 'Session expired. Please sign in again.';
    errEl.classList.remove('hidden');
  } else if (errEl) {
    errEl.classList.add('hidden');
  }

  const pwInput = document.getElementById('login-password');
  if (pwInput) pwInput.value = '';

  const userInput = document.getElementById('login-username');
  if (userInput && !userInput.value) userInput.focus();
  else if (pwInput) pwInput.focus();
}

function hideLoginScreen() {
  const el = document.getElementById('login-screen');
  if (el) el.classList.add('hidden');
  const errEl = document.getElementById('login-error');
  if (errEl) errEl.classList.add('hidden');
}

async function handleLoginSubmit(event) {
  event.preventDefault();

  const username = (document.getElementById('login-username')?.value || '').trim();
  const password = document.getElementById('login-password')?.value || '';
  const errEl = document.getElementById('login-error');
  const errTxt = document.getElementById('login-error-text');
  const btn = document.getElementById('login-submit-btn');
  const btnText = document.getElementById('login-btn-text');
  const spinner = document.getElementById('login-btn-spinner');

  if (!username || !password) {
    if (errTxt) errTxt.innerText = 'Username and password are required.';
    if (errEl) errEl.classList.remove('hidden');
    return;
  }

  if (errEl) errEl.classList.add('hidden');
  if (btn) btn.disabled = true;
  if (btnText) btnText.innerText = 'Authenticating...';
  if (spinner) spinner.classList.remove('hidden');

  try {
    const res = await originalFetch(`${API_BASE}/auth/login`, {
      method: 'POST',
      headers: { 'Content-Type': 'application/json' },
      body: JSON.stringify({ username, password })
    });

    const data = await res.json();
    if (res.ok && data.success) {
      localStorage.setItem('debtik_token', data.token);
      state.currentUser = data.user;
      updateUserProfileHeader(data.user);
      hideLoginScreen();
      state.isPolling = true;

      showToast('Authenticated', `Signed in as ${data.user.username}`, 'success');
      const hash = window.location.hash.replace('#', '') || 'dashboard';
      navigate(hash);
      fetchData();
      initLiveTrafficStream();

      // Ensure background telemetry polling is active
      if (!window._telemetryInterval) {
        window._telemetryInterval = setInterval(() => {
          if (state.isPolling && state.currentUser && !document.hidden) {
            fetchData(false);
          }
        }, 5000);
      }
    } else {
      if (errTxt) errTxt.innerText = data.message || 'Invalid username or password';
      if (errEl) errEl.classList.remove('hidden');
    }
  } catch (err) {
    if (errTxt) errTxt.innerText = err.message || 'Failed to connect to router';
    if (errEl) errEl.classList.remove('hidden');
  } finally {
    if (btn) btn.disabled = false;
    if (btnText) btnText.innerText = 'Sign In to Controller';
    if (spinner) spinner.classList.add('hidden');
  }
}

async function handleLogoutClick() {
  try {
    await originalFetch(`${API_BASE}/auth/logout`, {
      method: 'POST',
      headers: {
        'Authorization': `Bearer ${localStorage.getItem('debtik_token') || ''}`
      }
    });
  } catch (e) {}

  stopSessionPolling();
  localStorage.removeItem('debtik_token');
  state.currentUser = null;
  state.isPolling = false;

  if (window._telemetryInterval) {
    clearInterval(window._telemetryInterval);
    window._telemetryInterval = null;
  }
  if (trafficEventSource) {
    trafficEventSource.close();
    trafficEventSource = null;
  }
  if (trafficPollFallback) {
    clearInterval(trafficPollFallback);
    trafficPollFallback = null;
  }

  showLoginScreen(false);
  showToast('Signed Out', 'You have been signed out successfully', 'info');
}

function togglePasswordVisibility(id) {
  const input = document.getElementById(id);
  if (!input) return;
  input.type = input.type === 'password' ? 'text' : 'password';
}

function toggleUserMenu() {
  const menu = document.getElementById('user-menu-dropdown');
  if (menu) menu.classList.toggle('hidden');
}

function closeUserMenu() {
  const menu = document.getElementById('user-menu-dropdown');
  if (menu) menu.classList.add('hidden');
}

// Close user menu on outside click
document.addEventListener('click', (e) => {
  const menu = document.getElementById('user-menu-dropdown');
  if (!menu || menu.classList.contains('hidden')) return;
  if (!e.target.closest('#user-menu-dropdown') && !e.target.closest('button[onclick*="toggleUserMenu"]')) {
    menu.classList.add('hidden');
  }
});

function updateUserProfileHeader(user) {
  if (!user) return;
  const navName = document.getElementById('nav-user-name');
  if (navName) navName.innerText = user.username;

  const dropName = document.getElementById('dropdown-user-name');
  if (dropName) dropName.innerText = user.username;

  const navRole = document.getElementById('nav-user-role');
  if (navRole) navRole.innerText = (user.role || 'read').toUpperCase();

  const navAvatar = document.getElementById('nav-user-avatar');
  if (navAvatar) {
    const initials = (user.username || 'AD').slice(0, 2).toUpperCase();
    navAvatar.innerText = initials;
  }

  const statCurUser = document.getElementById('stat-current-user');
  if (statCurUser) statCurUser.innerText = user.username;

  const statCurRole = document.getElementById('stat-current-role');
  if (statCurRole) statCurRole.innerText = (user.role || 'read').toUpperCase();

  // Role permissions UI visibility: hide user management for non-admins
  const isFullAdmin = user.role === 'full';
  const navUsers = document.getElementById('nav-users');
  if (navUsers) {
    if (isFullAdmin) navUsers.classList.remove('hidden');
    else navUsers.classList.add('hidden');
  }

  const dropdownUsers = document.getElementById('dropdown-item-users');
  if (dropdownUsers) {
    if (isFullAdmin) dropdownUsers.classList.remove('hidden');
    else dropdownUsers.classList.add('hidden');
  }
}

// ================= User Management CRUD =================

async function loadUsers(isManual = false) {
  try {
    const res = await fetch(`${API_BASE}/users`);
    if (res.status === 403) {
      const tbody = document.getElementById('users-table-tbody');
      if (tbody) {
        tbody.innerHTML = `
          <tr>
            <td colspan="6" class="p-6 text-center text-amber-400 font-sans">
              <div class="inline-flex items-center gap-2">
                <svg class="w-5 h-5 text-amber-400" fill="none" stroke="currentColor" viewBox="0 0 24 24"><path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M12 9v2m0 4h.01m-6.938 4h13.856c1.54 0 2.502-1.667 1.732-3L13.732 4c-.77-1.333-2.694-1.333-3.464 0L3.34 16c-.77 1.333.192 3 1.732 3z"/></svg>
                <span>Viewing and managing users requires Super Administrator (full) permissions.</span>
              </div>
            </td>
          </tr>
        `;
      }
      return;
    }

    if (res.ok) {
      state.users = await res.json();
      renderUsersTable();

      const totalUsers = document.getElementById('stat-total-users');
      if (totalUsers) totalUsers.innerText = state.users.length;

      const adminCount = state.users.filter(u => u.role === 'full' && !u.disabled).length;
      const adminUsers = document.getElementById('stat-admin-users');
      if (adminUsers) adminUsers.innerText = adminCount;

      const badgeCount = document.getElementById('badge-users-count');
      if (badgeCount) badgeCount.innerText = state.users.length;

      if (isManual) showToast('Refreshed', 'User list updated', 'info');
    }
  } catch (err) {
    console.error('Failed to load users:', err);
  }
}

function renderUsersTable() {
  const tbody = document.getElementById('users-table-tbody');
  const emptyState = document.getElementById('users-empty-state');
  if (!tbody) return;

  tbody.innerHTML = '';
  const query = (document.getElementById('users-search-input')?.value || '').trim().toLowerCase();

  const filtered = (state.users || []).filter(u => {
    if (!query) return true;
    return u.username.toLowerCase().includes(query) ||
      (u.role || '').toLowerCase().includes(query) ||
      (u.comment || '').toLowerCase().includes(query);
  });

  if (filtered.length === 0) {
    if (emptyState) emptyState.classList.remove('hidden');
    return;
  }
  if (emptyState) emptyState.classList.add('hidden');

  const currentAuthUser = state.currentUser?.username || '';

  filtered.forEach(u => {
    const isSelf = u.username === currentAuthUser;
    const isFull = u.role === 'full';
    const isWrite = u.role === 'write';

    let roleBadge = `<span class="px-2 py-0.5 rounded text-[10px] font-bold bg-slate-800 text-slate-300 border border-slate-700">READ (OBSERVER)</span>`;
    if (isFull) {
      roleBadge = `<span class="px-2 py-0.5 rounded text-[10px] font-bold bg-purple-500/15 text-purple-300 border border-purple-500/30">FULL (SUPER ADMIN)</span>`;
    } else if (isWrite) {
      roleBadge = `<span class="px-2 py-0.5 rounded text-[10px] font-bold bg-sky-500/15 text-sky-300 border border-sky-500/30">WRITE (OPERATOR)</span>`;
    }

    const statusBadge = u.disabled
      ? `<span class="inline-flex items-center gap-1.5 px-2 py-0.5 rounded-full text-[10px] font-semibold bg-rose-500/15 text-rose-300 border border-rose-500/30"><span class="w-1.5 h-1.5 rounded-full bg-rose-400"></span>Disabled</span>`
      : `<span class="inline-flex items-center gap-1.5 px-2 py-0.5 rounded-full text-[10px] font-semibold bg-emerald-500/15 text-emerald-300 border border-emerald-500/30"><span class="w-1.5 h-1.5 rounded-full bg-emerald-400"></span>Active</span>`;

    let lastLoginText = 'Never';
    if (u.last_login_at && !u.last_login_at.startsWith('0001-01-01')) {
      const dt = new Date(u.last_login_at);
      lastLoginText = dt.toLocaleString();
    }

    const initials = u.username.slice(0, 2).toUpperCase();

    const tr = document.createElement('tr');
    tr.className = 'hover:bg-slate-800/40 transition group';

    tr.innerHTML = `
      <td class="py-3 px-4">
        <div class="flex items-center gap-3">
          <div class="w-8 h-8 rounded-xl bg-slate-800 border border-slate-700/80 flex items-center justify-center font-bold text-xs text-white">
            ${initials}
          </div>
          <div>
            <div class="font-bold text-white text-xs flex items-center gap-2">
              <span>${escapeHtml(u.username)}</span>
              ${isSelf ? '<span class="text-[9px] bg-brand-500/20 text-brand-300 border border-brand-500/30 px-1.5 py-0.2 rounded font-mono">YOU</span>' : ''}
            </div>
            <div class="text-[10px] text-slate-500 font-sans">Created: ${u.created_at ? new Date(u.created_at).toLocaleDateString() : '-'}</div>
          </div>
        </div>
      </td>
      <td class="py-3 px-4 font-sans">
        ${roleBadge}
      </td>
      <td class="py-3 px-4 font-sans">
        ${statusBadge}
      </td>
      <td class="py-3 px-4 text-slate-300 font-sans text-xs">
        ${escapeHtml(u.comment) || '<span class="text-slate-600">-</span>'}
      </td>
      <td class="py-3 px-4 text-slate-400 text-xs">
        ${lastLoginText}
      </td>
      <td class="py-3 px-4 text-right space-x-1.5 font-sans">
        <button onclick="openAdminResetPasswordModal('${escapeHtml(u.username)}')"
                class="p-1.5 rounded-lg text-slate-400 hover:text-amber-400 hover:bg-slate-800 transition" title="Reset User Password">
          <svg class="w-4 h-4" fill="none" stroke="currentColor" viewBox="0 0 24 24"><path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M15 7a2 2 0 012 2m4 0a6 6 0 01-7.743 5.743L11 17H9v2H7v2H4a1 1 0 01-1-1v-2.586a1 1 0 01.293-.707l5.964-5.964A6 6 0 1121 9z"/></svg>
        </button>
        <button onclick="openEditUserModal('${escapeHtml(u.username)}')"
                class="p-1.5 rounded-lg text-slate-400 hover:text-cyan-400 hover:bg-slate-800 transition" title="Edit User">
          <svg class="w-4 h-4" fill="none" stroke="currentColor" viewBox="0 0 24 24"><path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M11 5H6a2 2 0 00-2 2v11a2 2 0 002 2h11a2 2 0 002-2v-5m-1.414-9.414a2 2 0 112.828 2.828L11.828 15H9v-2.828l8.586-8.586z"/></svg>
        </button>
        ${!isSelf ? `
          <button onclick="deleteUser('${escapeHtml(u.username)}')"
                  class="p-1.5 rounded-lg text-slate-400 hover:text-rose-400 hover:bg-slate-800 transition" title="Delete User">
            <svg class="w-4 h-4" fill="none" stroke="currentColor" viewBox="0 0 24 24"><path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M19 7l-.867 12.142A2 2 0 0116.138 21H7.862a2 2 0 01-1.995-1.858L5 7m5 4v6m4-6v6m1-10V4a1 1 0 00-1-1h-4a1 1 0 00-1 1v3M4 7h16"/></svg>
          </button>
        ` : ''}
      </td>
    `;
    tbody.appendChild(tr);
  });
}

function openAddUserModal() {
  document.getElementById('user-add-username').value = '';
  document.getElementById('user-add-password').value = '';
  document.getElementById('user-add-confirm').value = '';
  document.getElementById('user-add-role').value = 'full';
  document.getElementById('user-add-comment').value = '';
  document.getElementById('modal-add-user')?.classList.remove('hidden');
  document.getElementById('user-add-username')?.focus();
}

function closeAddUserModal() {
  document.getElementById('modal-add-user')?.classList.add('hidden');
}

async function submitAddUser(event) {
  event.preventDefault();
  const username = (document.getElementById('user-add-username')?.value || '').trim();
  const password = document.getElementById('user-add-password')?.value || '';
  const confirm = document.getElementById('user-add-confirm')?.value || '';
  const role = document.getElementById('user-add-role')?.value || 'full';
  const comment = (document.getElementById('user-add-comment')?.value || '').trim();

  if (password !== confirm) {
    showToast('Validation Error', 'Passwords do not match', 'warning');
    return;
  }
  if (password.length < 4) {
    showToast('Validation Error', 'Password must be at least 4 characters', 'warning');
    return;
  }

  try {
    const res = await fetch(`${API_BASE}/users`, {
      method: 'POST',
      headers: { 'Content-Type': 'application/json' },
      body: JSON.stringify({ username, password, role, comment })
    });
    const data = await res.json();
    if (res.ok) {
      showToast('User Created', `Created user ${username} with ${role.toUpperCase()} permissions`, 'success');
      closeAddUserModal();
      loadUsers(false);
    } else {
      showToast('Error', data.message || 'Failed to create user', 'error');
    }
  } catch (err) {
    showToast('Error', err.message, 'error');
  }
}

function openEditUserModal(username) {
  const user = (state.users || []).find(u => u.username === username);
  if (!user) return;

  document.getElementById('user-edit-username').value = user.username;
  document.getElementById('user-edit-username-title').innerText = `@${user.username}`;
  document.getElementById('user-edit-role').value = user.role || 'read';
  document.getElementById('user-edit-comment').value = user.comment || '';
  document.getElementById('user-edit-disabled').checked = !!user.disabled;

  document.getElementById('modal-edit-user')?.classList.remove('hidden');
}

function closeEditUserModal() {
  document.getElementById('modal-edit-user')?.classList.add('hidden');
}

async function submitEditUser(event) {
  event.preventDefault();
  const username = document.getElementById('user-edit-username')?.value;
  const role = document.getElementById('user-edit-role')?.value || 'read';
  const comment = (document.getElementById('user-edit-comment')?.value || '').trim();
  const disabled = document.getElementById('user-edit-disabled')?.checked || false;

  try {
    const res = await fetch(`${API_BASE}/users/${encodeURIComponent(username)}`, {
      method: 'PUT',
      headers: { 'Content-Type': 'application/json' },
      body: JSON.stringify({ role, comment, disabled })
    });
    const data = await res.json();
    if (res.ok) {
      showToast('User Updated', `Updated settings for ${username}`, 'success');
      closeEditUserModal();
      loadUsers(false);

      // If updated own role/disabled status, refresh self profile
      if (username === state.currentUser?.username) {
        checkAuthStatus();
      }
    } else {
      showToast('Error', data.message || 'Failed to update user', 'error');
    }
  } catch (err) {
    showToast('Error', err.message, 'error');
  }
}

function openAdminResetPasswordModal(username) {
  document.getElementById('admin-reset-username').value = username;
  document.getElementById('admin-reset-username-title').innerText = `@${username}`;
  document.getElementById('admin-reset-new-pw').value = '';
  document.getElementById('admin-reset-confirm-pw').value = '';
  document.getElementById('modal-admin-reset-pw')?.classList.remove('hidden');
  document.getElementById('admin-reset-new-pw')?.focus();
}

function closeAdminResetPasswordModal() {
  document.getElementById('modal-admin-reset-pw')?.classList.add('hidden');
}

async function submitAdminResetPassword(event) {
  event.preventDefault();
  const username = document.getElementById('admin-reset-username')?.value;
  const newPassword = document.getElementById('admin-reset-new-pw')?.value || '';
  const confirm = document.getElementById('admin-reset-confirm-pw')?.value || '';

  if (newPassword !== confirm) {
    showToast('Validation Error', 'Passwords do not match', 'warning');
    return;
  }
  if (newPassword.length < 4) {
    showToast('Validation Error', 'Password must be at least 4 characters', 'warning');
    return;
  }

  try {
    const res = await fetch(`${API_BASE}/users/${encodeURIComponent(username)}/password`, {
      method: 'POST',
      headers: { 'Content-Type': 'application/json' },
      body: JSON.stringify({ new_password: newPassword })
    });
    const data = await res.json();
    if (res.ok) {
      showToast('Password Reset', `Password for user ${username} updated successfully`, 'success');
      closeAdminResetPasswordModal();
    } else {
      showToast('Error', data.message || 'Failed to reset password', 'error');
    }
  } catch (err) {
    showToast('Error', err.message, 'error');
  }
}

async function deleteUser(username) {
  if (username === state.currentUser?.username) {
    showToast('Action Forbidden', 'You cannot delete your own account', 'warning');
    return;
  }

  if (!confirm(`Are you sure you want to completely remove user "${username}"?`)) {
    return;
  }

  try {
    const res = await fetch(`${API_BASE}/users/${encodeURIComponent(username)}`, {
      method: 'DELETE'
    });
    const data = await res.json();
    if (res.ok) {
      showToast('User Deleted', `User ${username} has been removed`, 'success');
      loadUsers(false);
    } else {
      showToast('Error', data.message || 'Failed to delete user', 'error');
    }
  } catch (err) {
    showToast('Error', err.message, 'error');
  }
}

function openSelfPasswordModal() {
  document.getElementById('self-current-password').value = '';
  document.getElementById('self-new-password').value = '';
  document.getElementById('self-confirm-password').value = '';
  document.getElementById('modal-self-password')?.classList.remove('hidden');
  document.getElementById('self-current-password')?.focus();
}

function closeSelfPasswordModal() {
  document.getElementById('modal-self-password')?.classList.add('hidden');
}

async function submitSelfPassword(event) {
  event.preventDefault();
  const oldPassword = document.getElementById('self-current-password')?.value || '';
  const newPassword = document.getElementById('self-new-password')?.value || '';
  const confirm = document.getElementById('self-confirm-password')?.value || '';

  if (newPassword !== confirm) {
    showToast('Validation Error', 'New passwords do not match', 'warning');
    return;
  }
  if (newPassword.length < 4) {
    showToast('Validation Error', 'Password must be at least 4 characters', 'warning');
    return;
  }

  try {
    const res = await fetch(`${API_BASE}/auth/change-password`, {
      method: 'POST',
      headers: { 'Content-Type': 'application/json' },
      body: JSON.stringify({ old_password: oldPassword, new_password: newPassword })
    });
    const data = await res.json();
    if (res.ok) {
      showToast('Password Changed', 'Your password has been changed successfully', 'success');
      closeSelfPasswordModal();
    } else {
      showToast('Error', data.message || 'Failed to change password', 'error');
    }
  } catch (err) {
    showToast('Error', err.message, 'error');
  }
}

// ==================== MANAGEMENT SERVICES (/ip service) ====================
state.services = [];

async function loadServices(manual = false) {
  try {
    const res = await fetch(`${API_BASE}/system/services`);
    if (!res.ok) throw new Error('Failed to load services');
    const data = await res.json();
    state.services = data || [];
    renderServicesTable();
    updateCertificatesBadges();
    if (manual) showToast('Services Updated', 'Service status synchronized', 'success');
  } catch (err) {
    if (manual) showToast('Error', err.message, 'error');
  }
}

function renderServicesTable() {
  const tbody = document.getElementById('services-table-body');
  if (!tbody) return;

  if (!state.services || state.services.length === 0) {
    tbody.innerHTML = '<tr><td colspan="5" class="py-6 text-center text-slate-500 text-xs">No services configured.</td></tr>';
    return;
  }

  tbody.innerHTML = state.services.map(s => {
    const isOff = s.disabled;
    const statusBadge = isOff
      ? '<span class="px-2 py-0.5 rounded text-[10px] bg-rose-500/20 text-rose-300 border border-rose-500/30 font-bold uppercase">Disabled</span>'
      : '<span class="px-2 py-0.5 rounded text-[10px] bg-emerald-500/20 text-emerald-300 border border-emerald-500/30 font-bold uppercase">Active</span>';

    const toggleBtn = isOff
      ? `<button onclick="toggleServiceState('${s.name}', false)" class="px-2.5 py-1 rounded-lg bg-emerald-500/20 text-emerald-300 hover:bg-emerald-500/30 border border-emerald-500/40 text-[11px] font-bold transition">Enable</button>`
      : `<button onclick="toggleServiceState('${s.name}', true)" class="px-2.5 py-1 rounded-lg bg-rose-500/20 text-rose-300 hover:bg-rose-500/30 border border-rose-500/40 text-[11px] font-bold transition">Disable</button>`;

    let certBadge = '';
    if (s.name === 'www-ssl') {
      if (s.certificate) {
        certBadge = `<span class="ml-2 inline-flex items-center gap-1 px-1.5 py-0.5 rounded text-[10px] bg-slate-800 text-amber-300 border border-slate-700 font-mono">🔒 ${escapeHtml(s.certificate)}</span>`;
      } else {
        certBadge = `<span class="ml-2 inline-flex items-center gap-1 px-1.5 py-0.5 rounded text-[10px] bg-rose-500/10 text-rose-400 border border-rose-500/20 font-mono">⚠️ No Cert Selected</span>`;
      }
    }

    const certArg = s.certificate ? `'${escapeHtml(s.certificate)}'` : "''";

    return `
      <tr class="hover:bg-slate-800/40 transition">
        <td class="py-3 px-4 font-bold text-white uppercase">${s.name} ${certBadge}</td>
        <td class="py-3 px-4">
          <div class="flex items-center gap-2">
            <span class="text-cyan-400 font-mono font-bold">${s.port}</span>
            <button onclick="openEditServiceModal('${s.name}', ${s.port}, ${s.disabled}, ${certArg})" title="Edit Service" class="text-slate-500 hover:text-cyan-400 p-1 rounded hover:bg-slate-800/80 transition">
              <svg class="w-3.5 h-3.5" fill="none" stroke="currentColor" viewBox="0 0 24 24"><path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M15.232 5.232l3.536 3.536m-2.036-5.036a2.5 2.5 0 113.536 3.536L6.5 21.036H3v-3.572L16.732 3.732z"/></svg>
            </button>
          </div>
        </td>
        <td class="py-3 px-4">${statusBadge}</td>
        <td class="py-3 px-4 text-slate-400 text-xs font-sans">${s.comment || '-'}</td>
        <td class="py-3 px-4 text-right">
          <div class="flex items-center justify-end gap-2">
            <button onclick="openEditServiceModal('${s.name}', ${s.port}, ${s.disabled}, ${certArg})" class="px-2.5 py-1 rounded-lg bg-slate-800 hover:bg-slate-700 text-slate-300 hover:text-white border border-slate-700 text-[11px] font-medium transition inline-flex items-center gap-1">
              <svg class="w-3.5 h-3.5 text-slate-400" fill="none" stroke="currentColor" viewBox="0 0 24 24"><path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M15.232 5.232l3.536 3.536m-2.036-5.036a2.5 2.5 0 113.536 3.536L6.5 21.036H3v-3.572L16.732 3.732z"/></svg>
              <span>Edit</span>
            </button>
            ${toggleBtn}
          </div>
        </td>
      </tr>
    `;
  }).join('');
}

function openEditServiceModal(serviceName, currentPort, isDisabled, currentCert = '') {
  document.getElementById('modal-service-name').value = serviceName;
  document.getElementById('modal-service-disabled').value = String(isDisabled);
  document.getElementById('modal-service-display-name').textContent = serviceName.toUpperCase();
  document.getElementById('modal-service-port').value = currentPort;

  const hintEl = document.getElementById('modal-service-port-hint');
  const warnEl = document.getElementById('modal-service-warning');
  const certGroup = document.getElementById('modal-service-cert-group');
  const certSelect = document.getElementById('modal-service-cert-select');

  if (serviceName === 'www') {
    hintEl.textContent = 'Default HTTP web port: 80';
    warnEl.classList.remove('hidden');
    certGroup.classList.add('hidden');
  } else if (serviceName === 'www-ssl') {
    hintEl.textContent = 'Default HTTPS web port: 443';
    warnEl.classList.remove('hidden');
    certGroup.classList.remove('hidden');

    const populateCertOptions = (certs) => {
      certSelect.innerHTML = '<option value="">-- No Certificate Selected --</option>';
      (certs || []).forEach(c => {
        const opt = document.createElement('option');
        opt.value = c.name;
        opt.textContent = `${c.name} (${c.common_name})${c.is_ca ? ' [CA]' : ''}`;
        if (c.name === currentCert) opt.selected = true;
        certSelect.appendChild(opt);
      });
    };

    if (state.certificates && state.certificates.length > 0) {
      populateCertOptions(state.certificates);
    } else {
      loadCertificates(false).then(() => {
        populateCertOptions(state.certificates);
      });
    }
  } else if (serviceName === 'telnet') {
    hintEl.textContent = 'Default Telnet console port: 8282';
    warnEl.classList.add('hidden');
    certGroup.classList.add('hidden');
  } else if (serviceName === 'ssh') {
    hintEl.textContent = 'Default SSH port: 2222';
    warnEl.classList.add('hidden');
    certGroup.classList.add('hidden');
  } else {
    hintEl.textContent = '';
    warnEl.classList.add('hidden');
    certGroup.classList.add('hidden');
  }

  const modal = document.getElementById('modal-service-edit');
  modal.classList.remove('hidden');
  setTimeout(() => document.getElementById('modal-service-port').focus(), 50);
}

function closeEditServiceModal() {
  const modal = document.getElementById('modal-service-edit');
  if (modal) modal.classList.add('hidden');
}

async function submitSaveServicePort(event) {
  event.preventDefault();
  const name = document.getElementById('modal-service-name').value;
  const disabled = document.getElementById('modal-service-disabled').value === 'true';
  const port = parseInt(document.getElementById('modal-service-port').value, 10);

  if (isNaN(port) || port < 1 || port > 65535) {
    showToast('Invalid Port', 'Port must be a valid number between 1 and 65535', 'error');
    return;
  }

  const certSelect = document.getElementById('modal-service-cert-select');
  const certVal = (name === 'www-ssl' && certSelect) ? certSelect.value : '';

  try {
    const res = await fetch(`${API_BASE}/system/services/${name}`, {
      method: 'POST',
      headers: { 'Content-Type': 'application/json' },
      body: JSON.stringify({ port: port, disabled: disabled, certificate: certVal })
    });
    if (!res.ok) {
      const errData = await res.json();
      throw new Error(errData.message || 'Failed to update service settings');
    }

    closeEditServiceModal();
    showToast('Service Updated', `Service ${name.toUpperCase()} settings saved`, 'success');
    await loadServices();
  } catch (err) {
    showToast('Error', err.message, 'error');
  }
}

async function toggleServiceState(serviceName, newDisabled) {
  if (serviceName === 'www' && newDisabled) {
    if (!confirm("WARNING: Disabling the Web service ('www') will turn off this Web UI and REST API. You will only be able to re-enable it via SSH (port 2222) or Telnet (port 8282) using 'ip service enable www'. Continue?")) {
      return;
    }
  }

  if (serviceName === 'www-ssl' && !newDisabled) {
    const sslSvc = (state.services || []).find(s => s.name === 'www-ssl');
    if (!sslSvc || !sslSvc.certificate) {
      showToast('Certificate Required', 'Please assign an SSL/TLS certificate to www-ssl before enabling HTTPS.', 'warning');
      openEditServiceModal('www-ssl', sslSvc ? sslSvc.port : 443, false, '');
      return;
    }
  }

  try {
    const res = await fetch(`${API_BASE}/system/services/${serviceName}/state`, {
      method: 'POST',
      headers: { 'Content-Type': 'application/json' },
      body: JSON.stringify({ disabled: newDisabled })
    });
    if (!res.ok) {
      const errData = await res.json();
      throw new Error(errData.message || 'Failed to update service');
    }
    showToast('Service Updated', `Service ${serviceName} is now ${newDisabled ? 'disabled' : 'enabled'}`, 'success');
    await loadServices();
  } catch (err) {
    showToast('Error', err.message, 'error');
  }
}

// ==================== SYSTEM LOGS (/log) ====================
state.logs = [];
let logsTimer = null;

async function loadLogs(manual = false) {
  const limitEl = document.getElementById('logs-limit-select');
  const limit = limitEl ? limitEl.value : '100';

  try {
    const res = await fetch(`${API_BASE}/system/logs?limit=${limit}`);
    if (!res.ok) throw new Error('Failed to load logs');
    const data = await res.json();
    state.logs = data.logs || [];
    renderLogsTable();
    if (manual) showToast('Logs Refreshed', `Fetched ${state.logs.length} log records`, 'success');
  } catch (err) {
    if (manual) showToast('Error', err.message, 'error');
  }

  // Setup auto-refresh if enabled and on logs tab
  if (!logsTimer && state.currentUser) {
    logsTimer = setInterval(() => {
      if (state.currentUser && !document.hidden && state.activeTab === 'logs') {
        const auto = document.getElementById('logs-auto-refresh');
        if (auto && auto.checked) {
          loadLogs(false);
        }
      }
    }, 3000);
  }
}

function renderLogsTable() {
  const tbody = document.getElementById('logs-table-body');
  if (!tbody) return;

  const search = (document.getElementById('logs-search-input')?.value || '').toLowerCase();
  const topicFilter = (document.getElementById('logs-topic-filter')?.value || '').toLowerCase();

  const filtered = state.logs.filter(entry => {
    if (topicFilter && !entry.topics.toLowerCase().includes(topicFilter)) {
      return false;
    }
    if (search && !entry.message.toLowerCase().includes(search) && !entry.topics.toLowerCase().includes(search)) {
      return false;
    }
    return true;
  });

  if (filtered.length === 0) {
    tbody.innerHTML = '<tr><td colspan="4" class="py-8 text-center text-slate-500 text-xs">No matching log entries found.</td></tr>';
    return;
  }

  tbody.innerHTML = filtered.map(l => {
    let topicColor = 'bg-slate-800 text-slate-300 border-slate-700';
    const topLower = l.topics.toLowerCase();
    if (topLower.includes('auth')) {
      topicColor = 'bg-amber-500/20 text-amber-300 border-amber-500/30';
    } else if (topLower.includes('dhcp')) {
      topicColor = 'bg-cyan-500/20 text-cyan-300 border-cyan-500/30';
    } else if (topLower.includes('route')) {
      topicColor = 'bg-blue-500/20 text-blue-300 border-blue-500/30';
    } else if (topLower.includes('firewall')) {
      topicColor = 'bg-rose-500/20 text-rose-300 border-rose-500/30';
    } else if (topLower.includes('error')) {
      topicColor = 'bg-red-500/20 text-red-300 border-red-500/30';
    } else if (topLower.includes('system')) {
      topicColor = 'bg-emerald-500/20 text-emerald-300 border-emerald-500/30';
    }

    const d = new Date(l.time);
    const timeStr = d.toLocaleDateString('en-US', { month: 'short', day: '2-digit' }) + ' ' + d.toLocaleTimeString('en-US', { hour12: false });

    return `
      <tr class="hover:bg-slate-800/40 transition">
        <td class="py-2 px-3 text-slate-500 font-mono">${l.id}</td>
        <td class="py-2 px-3 text-slate-400 font-mono whitespace-nowrap">${timeStr}</td>
        <td class="py-2 px-3 whitespace-nowrap">
          <span class="px-2 py-0.5 rounded text-[10px] font-bold border ${topicColor}">${l.topics}</span>
        </td>
        <td class="py-2 px-3 text-slate-200 font-mono break-all">${escapeHtml(l.message)}</td>
      </tr>
    `;
  }).join('');
}

// ==================== CERTIFICATES & SSL/TLS (/certificate) ====================
state.certificates = [];

async function loadCertificates(manual = false) {
  try {
    const res = await fetch(`${API_BASE}/certificates`);
    if (!res.ok) throw new Error('Failed to load certificates');
    state.certificates = await res.json() || [];
    updateCertificatesBadges();
    renderCertificatesTable();
    if (manual) showToast('Certificates Updated', `Loaded ${state.certificates.length} certificates`, 'success');
  } catch (err) {
    if (manual) showToast('Error', err.message, 'error');
  }
}

function updateCertificatesBadges() {
  const total = (state.certificates || []).length;
  const caCount = (state.certificates || []).filter(c => c.is_ca).length;

  const bCount = document.getElementById('badge-certs-count');
  if (bCount) bCount.innerText = total;

  const kpiTotal = document.getElementById('kpi-certs-total');
  if (kpiTotal) kpiTotal.innerText = total;

  const kpiCA = document.getElementById('kpi-certs-ca');
  if (kpiCA) kpiCA.innerText = caCount;

  const kpiHttps = document.getElementById('kpi-https-status');
  if (kpiHttps) {
    const sslSvc = (state.services || []).find(s => s.name === 'www-ssl');
    if (sslSvc) {
      if (!sslSvc.disabled) {
        kpiHttps.innerHTML = `<span class="text-emerald-400 font-bold">Enabled (Port ${sslSvc.port})</span><div class="text-[10px] text-slate-400 font-mono truncate">Cert: ${escapeHtml(sslSvc.certificate || 'None')}</div>`;
      } else {
        kpiHttps.innerHTML = `<span class="text-rose-400 font-bold">Disabled (Port ${sslSvc.port})</span><div class="text-[10px] text-slate-500 font-mono truncate">Cert: ${escapeHtml(sslSvc.certificate || 'None')}</div>`;
      }
    }
  }
}

function renderCertificatesTable() {
  const tbody = document.getElementById('certs-table-body');
  if (!tbody) return;

  if (!state.certificates || state.certificates.length === 0) {
    tbody.innerHTML = '<tr><td colspan="6" class="py-8 text-center text-slate-500 text-xs">No certificates configured yet. Click "Create CA" or "Issue Cert" to begin.</td></tr>';
    return;
  }

  tbody.innerHTML = state.certificates.map(c => {
    let typeBadge = '';
    if (c.is_ca) {
      typeBadge = '<span class="px-2 py-0.5 rounded text-[10px] bg-blue-500/20 text-blue-300 border border-blue-500/30 font-bold uppercase">🏛 CA</span>';
    } else if (c.type === 'acme') {
      typeBadge = '<span class="px-2 py-0.5 rounded text-[10px] bg-emerald-500/20 text-emerald-300 border border-emerald-500/30 font-bold uppercase">🔒 Let\'s Encrypt</span>';
    } else if (c.issuer && c.issuer !== c.common_name) {
      typeBadge = '<span class="px-2 py-0.5 rounded text-[10px] bg-cyan-500/20 text-cyan-300 border border-cyan-500/30 font-bold uppercase">📜 Signed</span>';
    } else {
      typeBadge = '<span class="px-2 py-0.5 rounded text-[10px] bg-slate-700/60 text-slate-300 border border-slate-600 font-bold uppercase">📜 Self-Signed</span>';
    }

    const sansHtml = (c.sans && c.sans.length > 0)
      ? c.sans.map(s => `<span class="inline-block px-1.5 py-0.2 rounded text-[10px] bg-slate-800 text-slate-300 border border-slate-700 mr-1 mb-0.5">${escapeHtml(s)}</span>`).join('')
      : '<span class="text-slate-500">-</span>';

    const validTo = c.valid_to ? new Date(c.valid_to) : null;
    let validStr = '-';
    let validBadge = '';
    if (validTo && !isNaN(validTo.getTime())) {
      const now = new Date();
      const daysLeft = Math.round((validTo - now) / (1000 * 60 * 60 * 24));
      validStr = validTo.toLocaleDateString('en-US', { year: 'numeric', month: 'short', day: 'numeric' });
      if (daysLeft < 0) {
        validBadge = '<span class="ml-1 text-[10px] text-rose-400 font-bold">(Expired)</span>';
      } else if (daysLeft < 30) {
        validBadge = `<span class="ml-1 text-[10px] text-amber-400 font-bold">(${daysLeft}d left)</span>`;
      } else {
        validBadge = `<span class="ml-1 text-[10px] text-slate-400">(${daysLeft}d left)</span>`;
      }
    }

    return `
      <tr class="hover:bg-slate-800/40 transition">
        <td class="py-3 px-4">${typeBadge}</td>
        <td class="py-3 px-4">
          <div class="font-bold text-white">${escapeHtml(c.name)}</div>
          <div class="text-[10px] text-slate-400 font-sans truncate max-w-xs" title="${escapeHtml(c.common_name)}">${escapeHtml(c.common_name)}</div>
        </td>
        <td class="py-3 px-4 text-slate-300 text-xs truncate max-w-xs" title="${escapeHtml(c.issuer || '-')}">${escapeHtml(c.issuer || '-')}</td>
        <td class="py-3 px-4 max-w-xs">${sansHtml}</td>
        <td class="py-3 px-4 whitespace-nowrap text-xs text-slate-300">
          <span>${validStr}</span> ${validBadge}
          ${c.type === 'acme' ? `<div class="text-[10px] ${c.renewal_error ? 'text-rose-400' : 'text-slate-400'}">${c.renewal_error ? 'Renewal failed: ' + escapeHtml(c.renewal_error) : 'Automatic renewal enabled'}</div>` : ''}
          <div class="text-[10px] text-slate-500">${c.key_type || ''}</div>
        </td>
        <td class="py-3 px-4 text-right whitespace-nowrap">
          <div class="flex items-center justify-end gap-1.5">
            <button onclick="openViewCertModal('${c.name}')" title="View & Export PEM" class="px-2.5 py-1 rounded-lg bg-slate-800 hover:bg-slate-700 text-slate-300 hover:text-white border border-slate-700 text-[11px] font-medium transition inline-flex items-center gap-1">
              <svg class="w-3.5 h-3.5 text-cyan-400" fill="none" stroke="currentColor" viewBox="0 0 24 24"><path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M15 12a3 3 0 11-6 0 3 3 0 016 0z"/><path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M2.458 12C3.732 7.943 7.523 5 12 5c4.478 0 8.268 2.943 9.542 7-1.274 4.057-5.064 7-9.542 7-4.477 0-8.268-2.943-9.542-7z"/></svg>
              <span>View</span>
            </button>
            <button onclick="deleteCertificate('${c.name}')" title="Delete Certificate" class="px-2 py-1 rounded-lg bg-rose-500/10 hover:bg-rose-500/20 text-rose-400 border border-rose-500/30 text-[11px] transition">
              <svg class="w-3.5 h-3.5" fill="none" stroke="currentColor" viewBox="0 0 24 24"><path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M19 7l-.867 12.142A2 2 0 0116.138 21H7.862a2 2 0 01-1.995-1.858L5 7m5 4v6m4-6v6m1-10V4a1 1 0 00-1-1h-4a1 1 0 00-1 1v3M4 7h16"/></svg>
            </button>
          </div>
        </td>
      </tr>
    `;
  }).join('');
}

// Create CA
function openCreateCAModal() {
  document.getElementById('form-create-ca').reset();
  document.getElementById('ca-days').value = '3650';
  document.getElementById('ca-org').value = 'DebTik Network Appliance';
  document.getElementById('ca-country').value = 'GR';
  document.getElementById('ca-key-type').value = 'RSA-2048';
  document.getElementById('modal-create-ca').classList.remove('hidden');
  setTimeout(() => document.getElementById('ca-name').focus(), 50);
}
function closeCreateCAModal() {
  document.getElementById('modal-create-ca').classList.add('hidden');
}
async function submitCreateCA(event) {
  event.preventDefault();
  const payload = {
    name: document.getElementById('ca-name').value.trim(),
    common_name: document.getElementById('ca-cn').value.trim(),
    organization: document.getElementById('ca-org').value.trim(),
    country: document.getElementById('ca-country').value.trim(),
    days: parseInt(document.getElementById('ca-days').value, 10) || 3650,
    key_type: document.getElementById('ca-key-type').value
  };
  try {
    const res = await fetch(`${API_BASE}/certificates/ca`, {
      method: 'POST',
      headers: { 'Content-Type': 'application/json' },
      body: JSON.stringify(payload)
    });
    if (!res.ok) {
      const errData = await res.json();
      throw new Error(errData.message || 'Failed to create CA');
    }
    closeCreateCAModal();
    showToast('CA Created', `Root CA ${payload.name} generated successfully`, 'success');
    await loadCertificates();
  } catch (err) {
    showToast('Error', err.message, 'error');
  }
}

// Create Cert
function openCreateCertModal() {
  document.getElementById('form-create-cert').reset();
  document.getElementById('cert-days').value = '730';
  document.getElementById('cert-key-type').value = 'RSA-2048';

  const caSelect = document.getElementById('cert-ca-select');
  caSelect.innerHTML = '<option value="">[ Self-Signed Certificate ]</option>';
  (state.certificates || []).filter(c => c.is_ca).forEach(ca => {
    const opt = document.createElement('option');
    opt.value = ca.name;
    opt.textContent = `${ca.name} (${ca.common_name})`;
    caSelect.appendChild(opt);
  });

  document.getElementById('modal-create-cert').classList.remove('hidden');
  setTimeout(() => document.getElementById('cert-name').focus(), 50);
}
function closeCreateCertModal() {
  document.getElementById('modal-create-cert').classList.add('hidden');
}
async function submitCreateCert(event) {
  event.preventDefault();
  const rawSans = document.getElementById('cert-sans').value;
  const sansList = rawSans ? rawSans.split(',').map(s => s.trim()).filter(Boolean) : [];
  const caName = document.getElementById('cert-ca-select').value;

  const payload = {
    name: document.getElementById('cert-name').value.trim(),
    common_name: document.getElementById('cert-cn').value.trim(),
    ca_name: caName,
    sans: sansList,
    days: parseInt(document.getElementById('cert-days').value, 10) || 730,
    key_type: document.getElementById('cert-key-type').value,
    is_server: true
  };
  try {
    const res = await fetch(`${API_BASE}/certificates/generate`, {
      method: 'POST',
      headers: { 'Content-Type': 'application/json' },
      body: JSON.stringify(payload)
    });
    if (!res.ok) {
      const errData = await res.json();
      throw new Error(errData.message || 'Failed to issue certificate');
    }
    closeCreateCertModal();
    showToast('Certificate Issued', `Certificate ${payload.name} generated successfully`, 'success');
    await loadCertificates();
  } catch (err) {
    showToast('Error', err.message, 'error');
  }
}

// Let's Encrypt
function openLetsEncryptModal() {
  document.getElementById('form-letsencrypt').reset();
  document.getElementById('modal-letsencrypt').classList.remove('hidden');
  setTimeout(() => document.getElementById('le-domain').focus(), 50);
}
function closeLetsEncryptModal() {
  document.getElementById('modal-letsencrypt').classList.add('hidden');
}
async function submitLetsEncrypt(event) {
  event.preventDefault();
  const domain = document.getElementById('le-domain').value.trim();
  const email = document.getElementById('le-email').value.trim();
  let name = document.getElementById('le-name').value.trim();
  if (!name) name = domain.replace(/[^a-zA-Z0-9_-]/g, '-');
  const staging = document.getElementById('le-staging').checked;

  const btn = document.getElementById('btn-submit-letsencrypt');
  const origBtnHtml = btn.innerHTML;
  btn.disabled = true;
  btn.innerHTML = `<svg class="w-4 h-4 animate-spin text-white" fill="none" viewBox="0 0 24 24"><circle class="opacity-25" cx="12" cy="12" r="10" stroke="currentColor" stroke-width="4"></circle><path class="opacity-75" fill="currentColor" d="M4 12a8 8 0 018-8v8H4z"></path></svg> <span>Issuing (may take up to 60s)...</span>`;

  try {
    const res = await fetch(`${API_BASE}/certificates/letsencrypt`, {
      method: 'POST',
      headers: { 'Content-Type': 'application/json' },
      body: JSON.stringify({
        name: name,
        domain: domain,
        email: email,
        staging: staging
      })
    });
    if (!res.ok) {
      const errData = await res.json();
      throw new Error(errData.message || 'Let\'s Encrypt challenge failed');
    }
    closeLetsEncryptModal();
    showToast('Let\'s Encrypt Issued', `Successfully issued trusted certificate for ${domain}`, 'success');
    await loadCertificates();
  } catch (err) {
    showToast('Let\'s Encrypt Error', err.message, 'error');
  } finally {
    btn.disabled = false;
    btn.innerHTML = origBtnHtml;
  }
}

// Import Cert
function openImportCertModal() {
  document.getElementById('form-import-cert').reset();
  document.getElementById('modal-import-cert').classList.remove('hidden');
  setTimeout(() => document.getElementById('import-cert-name').focus(), 50);
}
function closeImportCertModal() {
  document.getElementById('modal-import-cert').classList.add('hidden');
}
async function submitImportCert(event) {
  event.preventDefault();
  const payload = {
    name: document.getElementById('import-cert-name').value.trim(),
    cert_pem: document.getElementById('import-cert-pem').value.trim(),
    key_pem: document.getElementById('import-key-pem').value.trim()
  };
  try {
    const res = await fetch(`${API_BASE}/certificates/import`, {
      method: 'POST',
      headers: { 'Content-Type': 'application/json' },
      body: JSON.stringify(payload)
    });
    if (!res.ok) {
      const errData = await res.json();
      throw new Error(errData.message || 'Failed to import certificate');
    }
    closeImportCertModal();
    showToast('Certificate Imported', `Imported ${payload.name} successfully`, 'success');
    await loadCertificates();
  } catch (err) {
    showToast('Error', err.message, 'error');
  }
}

// View / Export Modal
async function openViewCertModal(name) {
  const c = (state.certificates || []).find(x => x.name === name);
  if (!c) return;

  document.getElementById('view-cert-modal-title').textContent = `Certificate: ${c.name}`;
  document.getElementById('view-cert-cn').textContent = c.common_name || '-';
  document.getElementById('view-cert-issuer').textContent = c.issuer || '-';
  document.getElementById('view-cert-type').textContent = `${c.is_ca ? 'CA' : 'Server/Client'} (${c.key_type || 'Unknown'})`;
  document.getElementById('view-cert-validto').textContent = c.valid_to ? new Date(c.valid_to).toLocaleString() : '-';
  document.getElementById('view-cert-sans').textContent = (c.sans && c.sans.length > 0) ? c.sans.join(', ') : 'None';
  document.getElementById('view-cert-fp').textContent = c.fingerprint || '-';

  document.getElementById('view-cert-pem-text').value = 'Loading PEM...';
  document.getElementById('view-key-pem-text').value = 'Loading Key...';

  document.getElementById('modal-view-cert').classList.remove('hidden');

  try {
    const res = await fetch(`${API_BASE}/certificates/${encodeURIComponent(name)}/export`);
    if (!res.ok) throw new Error('Failed to export certificate PEM');
    const data = await res.json();
    document.getElementById('view-cert-pem-text').value = data.cert_pem || '';
    document.getElementById('view-key-pem-text').value = data.key_pem || '(Private key not available)';
  } catch (err) {
    document.getElementById('view-cert-pem-text').value = 'Error loading certificate PEM: ' + err.message;
    document.getElementById('view-key-pem-text').value = '';
  }
}
function closeViewCertModal() {
  document.getElementById('modal-view-cert').classList.add('hidden');
}
function copyCertPEM() {
  const text = document.getElementById('view-cert-pem-text').value;
  if (!text) return;
  navigator.clipboard.writeText(text).then(() => {
    showToast('Copied', 'Certificate PEM copied to clipboard', 'info');
  }).catch(() => {
    showToast('Error', 'Failed to copy to clipboard', 'error');
  });
}
function copyKeyPEM() {
  const text = document.getElementById('view-key-pem-text').value;
  if (!text) return;
  navigator.clipboard.writeText(text).then(() => {
    showToast('Copied', 'Private Key PEM copied to clipboard', 'info');
  }).catch(() => {
    showToast('Error', 'Failed to copy to clipboard', 'error');
  });
}

async function deleteCertificate(name) {
  if (!confirm(`Are you sure you want to delete certificate "${name}"? This action cannot be undone.`)) {
    return;
  }
  try {
    const res = await fetch(`${API_BASE}/certificates/${encodeURIComponent(name)}`, {
      method: 'DELETE'
    });
    if (!res.ok) {
      const errData = await res.json();
      throw new Error(errData.message || 'Failed to delete certificate');
    }
    showToast('Certificate Deleted', `Certificate "${name}" removed`, 'success');
    await loadCertificates();
  } catch (err) {
    showToast('Error', err.message, 'error');
  }
}





// Refresh immediately when returning to a backgrounded controller tab.
document.addEventListener('visibilitychange', () => {
  if (!state.currentUser) return;
  if (document.hidden) {
    if (trafficEventSource) trafficEventSource.close();
    trafficEventSource = null;
    if (trafficPollFallback) clearInterval(trafficPollFallback);
    trafficPollFallback = null;
  } else {
    fetchData(false);
    initLiveTrafficStream();
    if (state.activeTab === 'bwtest') loadBwTestView();
  }
});

async function loadUpdateStatus(populate = true) {
  try {
    const res = await fetch(`${API_BASE}/update/status`);
    if (!res.ok) throw new Error(await responseError(res));
    const data = await res.json();
    if (populate && document.activeElement?.id !== 'update-repository') document.getElementById('update-repository').value = data.repository || '';
    if (populate && document.activeElement?.id !== 'update-tls-pin') document.getElementById('update-tls-pin').value = data.tls_key_pin || '';
    document.getElementById('update-installed').textContent = data.installed_version || 'unknown';
    document.getElementById('update-state').textContent = data.state || 'idle';
    document.getElementById('update-log').textContent = data.log || '';
  } catch (err) { showToast('Update Status', err.message, 'error'); }
}
async function saveUpdateConfig() {
  try {
    const repository = document.getElementById('update-repository').value.trim();
    const branch = 'master';
    const tls_key_pin = document.getElementById('update-tls-pin').value.trim();
    const res = await fetch(`${API_BASE}/update/config`, {method:'POST',headers:{'Content-Type':'application/json'},body:JSON.stringify({repository,branch,tls_key_pin})});
    if (!res.ok) throw new Error(await responseError(res));
    document.getElementById('update-install-button').disabled = true;
    document.getElementById('update-available').textContent = '—';
    showToast('Update Source Saved', 'Repository and branch saved', 'success');
    await loadUpdateStatus(false);
  } catch (err) { showToast('Update Source', err.message, 'error'); }
}
async function checkUpdate() {
  try {
    const res = await fetch(`${API_BASE}/update/check`, {method:'POST'});
    if (!res.ok) throw new Error(await responseError(res));
    const data = await res.json();
    document.getElementById('update-available').textContent = data.available_version;
    document.getElementById('update-install-button').disabled = !data.update_available;
    showToast('Git Check', data.update_available ? 'An update is available' : 'No newer version available', 'info');
  } catch (err) { showToast('Git Check Failed', err.message, 'error'); }
}
async function startUpdate(action) {
  if (!confirm(action === 'rollback' ? 'Restore the previous version and restart DebTik?' : 'Install the newer release version and restart DebTik?')) return;
  try {
    const res = await fetch(`${API_BASE}/update/${action}`, {method:'POST'});
    if (!res.ok) throw new Error(await responseError(res));
    showToast('Update Started', 'The service will restart; reconnect after a few seconds', 'info');
    await loadUpdateStatus(false);
  } catch (err) { showToast('Update Failed', err.message, 'error'); }
}

async function resetCurrentRuleCounters() { return resetFirewallRuleCounter('filter', resetRuleCounterDisplay); }

async function resetCurrentNATRuleCounters() { return resetFirewallRuleCounter('nat', resetNATCounterDisplay); }

async function resetCurrentMangleRuleCounters() { return resetFirewallRuleCounter('mangle', resetMangleCounterDisplay); }

function safeFirewallRow(row) {
  const result = {...row};
  for (const [key,value] of Object.entries(result)) if (typeof value === 'string') result[key] = escapeHtml(value);
  result.id = encodeURIComponent(String(row.id || '')).replace(/'/g, '%27').replace(/\(/g, '%28').replace(/\)/g, '%29');
  return result;
}
function setFirewallDays(prefix, days) {
  const selected = days ? days.toLowerCase().split(',') : ['sun','mon','tue','wed','thu','fri','sat'];
  for (const d of ['sun','mon','tue','wed','thu','fri','sat']) { const el = document.getElementById(prefix+'-day-'+d); if (el) el.checked = selected.includes(d); }
}
function getFirewallDays(prefix) {
  if (document.getElementById(prefix+'-field-days')?.classList.contains('hidden')) return '';
  const selected = ['sun','mon','tue','wed','thu','fri','sat'].filter(d => document.getElementById(prefix+'-day-'+d)?.checked);
  if (!selected.length) throw new Error('Select at least one weekday, or remove the Days condition.');
  return selected.join(',');
}
async function resetFirewallRuleCounter(kind, resetDisplay) {
  const id = document.getElementById(kind+'-modal-id')?.value;
  if (!id) { resetDisplay(); return; }
  try {
    const response = await fetch(`${API_BASE}/firewall/${kind}/${encodeURIComponent(id)}/reset-counters`, {method:'POST'});
    if (!response.ok) { const error = await response.json(); throw new Error(error.message || 'Counter reset failed'); }
    resetDisplay(); await loadFirewall(false);
  } catch(error) { showToast('Error', error.message, 'error'); }
}

function reviewLegacyFirewallSettings(kind, id) {
  if (!id) return true;
  const rows = kind === 'filter' ? state.filterRules : kind === 'nat' ? state.natRules : state.mangleRules;
  const rule = (rows || []).find(r => r.id === id);
  if (!rule) return true;
  const unsupported = ['layer7_protocol','connection_bytes','connection_rate','pcc','in_bridge_port_list','out_bridge_port_list','tls_host','ingress_priority','priority','ipv4_options','dst_limit','psd','hotspot','route','sniff_target'];
  const present = unsupported.filter(key => rule[key]);
  if (!present.length) return true;
  return confirm('This saved rule contains unsupported settings: '+present.join(', ')+'. Saving removes them. Review the remaining match conditions before continuing.');
}

function refreshFirewallRejectTypes() {
  const select=document.getElementById('filter-modal-rejectwith'); if(!select) return;
  const old=select.value;
  const ipv6=document.getElementById('filter-modal-family')?.value==='6';
  const types=ipv6 ? ['icmp6-port-unreachable','icmp6-no-route','icmp6-adm-prohibited','icmp6-addr-unreachable','tcp-reset'] : ['icmp-port-unreachable','icmp-net-unreachable','icmp-host-unreachable','icmp-proto-unreachable','icmp-net-prohibited','icmp-host-prohibited','icmp-admin-prohibited','tcp-reset'];
  select.replaceChildren(...types.map(value=>{const option=document.createElement('option');option.value=value;option.textContent=value;return option}));
  if(types.includes(old))select.value=old;
}

function setFirewallActionSelection(kind, value) {
 const select=document.getElementById(kind+'-modal-action'); if(!select)return;
 if(!Array.from(select.options).some(option=>option.value===value)) {
  const option=document.createElement('option');option.value=value;option.textContent='Unsupported saved action: '+value;option.disabled=true;select.appendChild(option);
 }
 select.value=value;
}

// ==========================================
// REVERSE PROXY & APPLICATION GATEWAY
// ==========================================
state.proxyRules = [];
state.proxyConfig = null;

async function loadReverseProxy(manual = false) {
  try {
    const [cfgRes, rulesRes, certsRes] = await Promise.all([
      fetch(`${API_BASE}/proxy/config`),
      fetch(`${API_BASE}/proxy/rules`),
      fetch(`${API_BASE}/certificates`).catch(() => null)
    ]);

    if (!cfgRes.ok) throw new Error('Failed to load proxy config');
    if (!rulesRes.ok) throw new Error('Failed to load proxy rules');

    state.proxyConfig = await cfgRes.json();
    state.proxyRules = await rulesRes.json() || [];

    if (certsRes && certsRes.ok) {
      state.certificates = await certsRes.json() || [];
    }

    renderProxyRules(state.proxyRules);
    updateProxyMetrics();

    if (manual) showToast('Reverse Proxy', 'Proxy configuration and rules reloaded', 'success');
  } catch (err) {
    console.error('loadReverseProxy error:', err);
    if (manual) showToast('Error', err.message, 'error');
  }
}

function updateProxyMetrics() {
  const badge = document.getElementById('badge-proxy-count');
  if (badge) badge.textContent = (state.proxyRules || []).length;

  const metricRules = document.getElementById('proxy-metric-rules');
  if (metricRules) metricRules.textContent = (state.proxyRules || []).length;

  const cfg = state.proxyConfig;
  const statusEl = document.getElementById('proxy-metric-status');
  const portsEl = document.getElementById('proxy-metric-ports');

  if (cfg) {
    if (statusEl) {
      if (cfg.enabled) {
        statusEl.innerHTML = '<span class="w-2.5 h-2.5 rounded-full bg-emerald-500 animate-pulse"></span><span class="text-white">Active</span>';
      } else {
        statusEl.innerHTML = '<span class="w-2.5 h-2.5 rounded-full bg-rose-500"></span><span class="text-rose-400">Disabled</span>';
      }
    }
    if (portsEl) {
      portsEl.textContent = `HTTP: ${cfg.http_port || 80} | HTTPS: ${cfg.https_port || 443}`;
    }
  }

  let totalRequests = 0;
  const certSet = new Set();
  (state.proxyRules || []).forEach(r => {
    totalRequests += (r.stats && r.stats.requests) || 0;
    if (r.enabled && r.certificate) certSet.add(r.certificate.toLowerCase());
  });

  const metricRequests = document.getElementById('proxy-metric-requests');
  if (metricRequests) metricRequests.textContent = totalRequests.toLocaleString();

  const metricCerts = document.getElementById('proxy-metric-certs');
  if (metricCerts) metricCerts.textContent = certSet.size;
}

function renderProxyRules(rules) {
  const tbody = document.getElementById('proxy-rules-table-body');
  if (!tbody) return;

  if (!rules || rules.length === 0) {
    tbody.innerHTML = '<tr><td colspan="9" class="py-8 text-center text-slate-500 text-xs font-sans">No reverse proxy rules configured yet. Click "Add Proxy Rule" to begin.</td></tr>';
    return;
  }

  tbody.innerHTML = rules.map(r => {
    const isEnabled = r.enabled !== false;
    const domainsStr = (r.domains && r.domains.length > 0) ? r.domains.map(d => `<span class="px-1.5 py-0.5 rounded bg-slate-800 text-slate-200 border border-slate-700 font-mono text-[11px]">${escapeHtml(d)}</span>`).join(' ') : '<span class="px-1.5 py-0.5 rounded bg-violet-950/60 text-violet-300 border border-violet-800/40 font-mono text-[11px]">* (any)</span>';

    const pathBadge = `<span class="px-2 py-0.5 rounded bg-cyan-950/60 text-cyan-300 border border-cyan-800/40 font-mono text-[11px] font-bold">${escapeHtml(r.path || '/')}</span>`;

    let protoBadge = '<span class="px-1.5 py-0.5 rounded bg-slate-800 text-slate-300 text-[10px] font-mono">HTTP/S</span>';
    if (r.protocol === 'https') protoBadge = '<span class="px-1.5 py-0.5 rounded bg-emerald-950 text-emerald-400 border border-emerald-800/40 text-[10px] font-mono font-bold">HTTPS</span>';
    else if (r.protocol === 'http') protoBadge = '<span class="px-1.5 py-0.5 rounded bg-sky-950 text-sky-400 border border-sky-800/40 text-[10px] font-mono">HTTP</span>';

    const certBadge = r.certificate ? `<span class="ml-1 text-[10px] bg-amber-950 text-amber-300 border border-amber-800/40 px-1 py-0.5 rounded font-mono truncate max-w-[120px] inline-block align-bottom" title="${escapeHtml(r.certificate)}">🔒 ${escapeHtml(r.certificate)}</span>` : '';

    const stripBadge = r.strip_path ? '<span class="text-amber-400 text-[11px]">Yes</span>' : '<span class="text-slate-500 text-[11px]">No</span>';

    const requests = (r.stats && r.stats.requests) ? r.stats.requests.toLocaleString() : '0';

    return `
      <tr class="hover:bg-slate-800/40 transition">
        <td class="py-3 px-4">
          <button onclick="toggleProxyRuleState('${escapeHtml(r.id)}', ${isEnabled})" class="relative inline-flex h-5 w-9 flex-shrink-0 cursor-pointer rounded-full border-2 border-transparent transition-colors duration-200 ease-in-out focus:outline-none ${isEnabled ? 'bg-emerald-500' : 'bg-slate-700'}" title="${isEnabled ? 'Click to disable' : 'Click to enable'}">
            <span class="inline-block h-4 w-4 transform rounded-full bg-white shadow transition duration-200 ease-in-out ${isEnabled ? 'translate-x-4' : 'translate-x-0'}"></span>
          </button>
        </td>
        <td class="py-3 px-4">
          <div class="font-bold text-white text-xs">${escapeHtml(r.name || 'Unnamed Rule')}</div>
          ${r.comment ? `<div class="text-[10px] text-slate-400 font-sans truncate max-w-[200px]">${escapeHtml(r.comment)}</div>` : ''}
        </td>
        <td class="py-3 px-4 flex flex-wrap gap-1 items-center max-w-xs">
          ${domainsStr}
        </td>
        <td class="py-3 px-4">
          ${pathBadge}
        </td>
        <td class="py-3 px-4 font-mono text-slate-300 max-w-xs truncate" title="${escapeHtml(r.target_url || '')}">
          <span class="text-emerald-400">→</span> ${escapeHtml(r.target_url || '')}
        </td>
        <td class="py-3 px-4 whitespace-nowrap">
          ${protoBadge}${certBadge}
        </td>
        <td class="py-3 px-4 font-mono">
          ${stripBadge}
        </td>
        <td class="py-3 px-4 font-mono text-slate-300">
          ${requests}
        </td>
        <td class="py-3 px-4 text-right whitespace-nowrap">
          <button onclick="openEditProxyRuleModal('${escapeHtml(r.id)}')" class="px-2.5 py-1 rounded-lg bg-slate-800 hover:bg-slate-700 text-slate-300 text-xs mr-1 transition font-sans">Edit</button>
          <button onclick="deleteProxyRule('${escapeHtml(r.id)}')" class="px-2.5 py-1 rounded-lg bg-rose-950/40 hover:bg-rose-900/60 text-rose-300 border border-rose-800/40 text-xs transition font-sans">Delete</button>
        </td>
      </tr>
    `;
  }).join('');
}

function populateProxyCertDropdown(selectedVal = '') {
  const select = document.getElementById('proxy-rule-cert');
  if (!select) return;

  const certs = state.certificates || [];
  select.innerHTML = '<option value="">(None / Use Default Cert)</option>';

  certs.filter(c => !c.is_ca).forEach(c => {
    const opt = document.createElement('option');
    opt.value = c.name;
    const cn = c.common_name ? ` (${c.common_name})` : '';
    opt.textContent = `${c.name}${cn}`;
    if (selectedVal && selectedVal.toLowerCase() === c.name.toLowerCase()) {
      opt.selected = true;
    }
    select.appendChild(opt);
  });
}

function populateDefaultProxyCertDropdown(selectedVal = '') {
  const select = document.getElementById('proxy-cfg-default-cert');
  if (!select) return;

  const certs = state.certificates || [];
  select.innerHTML = '<option value="">(None / First Available Cert)</option>';

  certs.filter(c => !c.is_ca).forEach(c => {
    const opt = document.createElement('option');
    opt.value = c.name;
    const cn = c.common_name ? ` (${c.common_name})` : '';
    opt.textContent = `${c.name}${cn}`;
    if (selectedVal && selectedVal.toLowerCase() === c.name.toLowerCase()) {
      opt.selected = true;
    }
    select.appendChild(opt);
  });
}

function onProxyProtoChange() {
  const proto = document.getElementById('proxy-rule-proto')?.value;
  const certSelect = document.getElementById('proxy-rule-cert');
  const redirectCheck = document.getElementById('proxy-rule-http-to-https');

  if (proto === 'http') {
    if (certSelect) certSelect.disabled = true;
    if (redirectCheck) redirectCheck.disabled = true;
  } else {
    if (certSelect) certSelect.disabled = false;
    if (redirectCheck) redirectCheck.disabled = false;
  }
}

function openAddProxyRuleModal() {
  const modal = document.getElementById('modal-proxy-rule');
  if (!modal) return;

  document.getElementById('proxy-rule-modal-title').innerHTML = `
    <svg class="w-4 h-4 text-violet-400" fill="none" stroke="currentColor" viewBox="0 0 24 24"><path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M8 7h12m0 0l-4-4m4 4l-4 4m0 6H4m0 0l4 4m-4-4l4-4" /></svg>
    <span>Add Reverse Proxy Rule</span>
  `;
  document.getElementById('proxy-rule-id').value = '';
  document.getElementById('proxy-rule-name').value = '';
  document.getElementById('proxy-rule-domains').value = '';
  document.getElementById('proxy-rule-path').value = '/';
  document.getElementById('proxy-rule-target').value = '';
  document.getElementById('proxy-rule-proto').value = 'both';
  document.getElementById('proxy-rule-strip-path').checked = false;
  document.getElementById('proxy-rule-http-to-https').checked = false;
  document.getElementById('proxy-rule-preserve-host').checked = false;
  document.getElementById('proxy-rule-insecure-tls').checked = false;
  document.getElementById('proxy-rule-enabled').checked = true;
  document.getElementById('proxy-rule-comment').value = '';

  populateProxyCertDropdown('');
  onProxyProtoChange();

  modal.classList.remove('hidden');
}

function openEditProxyRuleModal(id) {
  const modal = document.getElementById('modal-proxy-rule');
  if (!modal) return;

  const rule = (state.proxyRules || []).find(r => r.id === id);
  if (!rule) {
    showToast('Error', 'Rule not found', 'error');
    return;
  }

  document.getElementById('proxy-rule-modal-title').innerHTML = `
    <svg class="w-4 h-4 text-violet-400" fill="none" stroke="currentColor" viewBox="0 0 24 24"><path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M11 5H6a2 2 0 00-2 2v11a2 2 0 002 2h11a2 2 0 002-2v-5m-1.414-9.414a2 2 0 112.828 2.828L11.828 15H9v-2.828l8.586-8.586z" /></svg>
    <span>Edit Reverse Proxy Rule</span>
  `;
  document.getElementById('proxy-rule-id').value = rule.id || '';
  document.getElementById('proxy-rule-name').value = rule.name || '';
  document.getElementById('proxy-rule-domains').value = (rule.domains || []).join(', ');
  document.getElementById('proxy-rule-path').value = rule.path || '/';
  document.getElementById('proxy-rule-target').value = rule.target_url || '';
  document.getElementById('proxy-rule-proto').value = rule.protocol || 'both';
  document.getElementById('proxy-rule-strip-path').checked = !!rule.strip_path;
  document.getElementById('proxy-rule-http-to-https').checked = !!rule.http_to_https;
  document.getElementById('proxy-rule-preserve-host').checked = !!rule.preserve_host;
  document.getElementById('proxy-rule-insecure-tls').checked = !!rule.insecure_tls;
  document.getElementById('proxy-rule-enabled').checked = rule.enabled !== false;
  document.getElementById('proxy-rule-comment').value = rule.comment || '';

  populateProxyCertDropdown(rule.certificate || '');
  onProxyProtoChange();

  modal.classList.remove('hidden');
}

function closeProxyRuleModal() {
  const modal = document.getElementById('modal-proxy-rule');
  if (modal) modal.classList.add('hidden');
}

async function saveProxyRule(event) {
  event.preventDefault();

  const id = document.getElementById('proxy-rule-id').value;
  const name = document.getElementById('proxy-rule-name').value.trim();
  const rawDomains = document.getElementById('proxy-rule-domains').value.trim();
  const pathVal = document.getElementById('proxy-rule-path').value.trim() || '/';
  const target = document.getElementById('proxy-rule-target').value.trim();
  const proto = document.getElementById('proxy-rule-proto').value;
  const cert = document.getElementById('proxy-rule-cert').value;
  const stripPath = document.getElementById('proxy-rule-strip-path').checked;
  const httpToHttps = document.getElementById('proxy-rule-http-to-https').checked;
  const preserveHost = document.getElementById('proxy-rule-preserve-host').checked;
  const insecureTLS = document.getElementById('proxy-rule-insecure-tls').checked;
  const enabled = document.getElementById('proxy-rule-enabled').checked;
  const comment = document.getElementById('proxy-rule-comment').value.trim();

  let domains = [];
  if (rawDomains && rawDomains !== '*') {
    domains = rawDomains.split(',').map(d => d.trim()).filter(d => d.length > 0);
  }

  const payload = {
    id: id || undefined,
    name,
    domains,
    path: pathVal,
    target_url: target,
    protocol: proto,
    certificate: cert,
    strip_path: stripPath,
    http_to_https: httpToHttps,
    preserve_host: preserveHost,
    insecure_tls: insecureTLS,
    enabled,
    comment
  };

  try {
    const url = id ? `${API_BASE}/proxy/rules/${encodeURIComponent(id)}` : `${API_BASE}/proxy/rules`;
    const method = id ? 'PUT' : 'POST';

    const res = await fetch(url, {
      method,
      headers: { 'Content-Type': 'application/json' },
      body: JSON.stringify(payload)
    });

    if (!res.ok) {
      const errData = await res.json().catch(() => ({}));
      throw new Error(errData.message || 'Failed to save proxy rule');
    }

    closeProxyRuleModal();
    showToast('Success', `Proxy rule "${name}" saved successfully`, 'success');
    await loadReverseProxy(false);
  } catch (err) {
    showToast('Error', err.message, 'error');
  }
}

async function deleteProxyRule(id) {
  const rule = (state.proxyRules || []).find(r => r.id === id);
  const name = rule ? rule.name : id;

  if (!confirm(`Are you sure you want to delete proxy rule "${name}"?`)) {
    return;
  }

  try {
    const res = await fetch(`${API_BASE}/proxy/rules/${encodeURIComponent(id)}`, {
      method: 'DELETE'
    });

    if (!res.ok) {
      const errData = await res.json().catch(() => ({}));
      throw new Error(errData.message || 'Failed to delete rule');
    }

    showToast('Rule Deleted', `Proxy rule "${name}" removed`, 'success');
    await loadReverseProxy(false);
  } catch (err) {
    showToast('Error', err.message, 'error');
  }
}

async function toggleProxyRuleState(id, currentState) {
  try {
    const res = await fetch(`${API_BASE}/proxy/rules/${encodeURIComponent(id)}/state`, {
      method: 'POST',
      headers: { 'Content-Type': 'application/json' },
      body: JSON.stringify({ enabled: !currentState })
    });

    if (!res.ok) {
      const errData = await res.json().catch(() => ({}));
      throw new Error(errData.message || 'Failed to toggle rule state');
    }

    await loadReverseProxy(false);
  } catch (err) {
    showToast('Error', err.message, 'error');
  }
}

function openProxyConfigModal() {
  const modal = document.getElementById('modal-proxy-config');
  if (!modal) return;

  const cfg = state.proxyConfig || { enabled: true, http_port: 80, https_port: 443, default_cert: '' };

  document.getElementById('proxy-cfg-enabled').checked = cfg.enabled !== false;
  document.getElementById('proxy-cfg-http-port').value = cfg.http_port || 80;
  document.getElementById('proxy-cfg-https-port').value = cfg.https_port || 443;

  populateDefaultProxyCertDropdown(cfg.default_cert || '');

  modal.classList.remove('hidden');
}

function closeProxyConfigModal() {
  const modal = document.getElementById('modal-proxy-config');
  if (modal) modal.classList.add('hidden');
}

async function saveProxyConfig(event) {
  event.preventDefault();

  const enabled = document.getElementById('proxy-cfg-enabled').checked;
  const httpPort = parseInt(document.getElementById('proxy-cfg-http-port').value, 10) || 80;
  const httpsPort = parseInt(document.getElementById('proxy-cfg-https-port').value, 10) || 443;
  const defaultCert = document.getElementById('proxy-cfg-default-cert').value;

  const payload = {
    enabled,
    http_port: httpPort,
    https_port: httpsPort,
    default_cert: defaultCert
  };

  try {
    const res = await fetch(`${API_BASE}/proxy/config`, {
      method: 'POST',
      headers: { 'Content-Type': 'application/json' },
      body: JSON.stringify(payload)
    });

    if (!res.ok) {
      const errData = await res.json().catch(() => ({}));
      throw new Error(errData.message || 'Failed to update proxy settings');
    }

    closeProxyConfigModal();
    showToast('Success', 'Reverse proxy settings updated', 'success');
    await loadReverseProxy(false);
  } catch (err) {
    showToast('Error', err.message, 'error');
  }
}